Rotational tunneling and neutron spectroscopy: A compilation

Chemical Reviews

Volumn 97, Issue 8, 1997, Pages 2933-2966

  Prager, M ^a,c,d,e   Heidemann, A ^b,c,f,g  

^a FORSCHUNGSZENTRUM JÜLICH   (Germany)

^b INSTITUT LAUE LANGEVIN   (France)

^c University of Tübingen ^*

^d UNIVERSITY OF TÜBINGEN   (Germany)

^e RUTHERFORD APPLETON LABORATORY   (United Kingdom)

^f TECHNICAL UNIVERSITY OF MUNICH   (Germany)

^g ILL   (France)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000846507     PISSN: 00092665     EISSN: None     Source Type: Journal    
DOI: 10.1021/cr9500848     Document Type: Article

References (526)

1. Hüller, A. Quantum-mechanical rotational excitation in crystals (Quantenmechanische Rotationsanregungen in Kristallen). Phys. Unserer Zeit 1996, 27, 131.
2. 4: Tunnelling states, rotations, and phase transition in a quantum molecular crystal. Solid State Commun. 1975, 17, 405.
3. Alefeld, B.; Kollmar, A. The methyl group rotation barrier of dimethylacetylene in the solid state at 4.5K Phys. Lett. 1976, 57A, 289.
4. Hüller, A.; Press, W. Rotational excitations and tunnelling. In Neutron Inelastic Scattering; IAEA: Vienna, 1978; Vol. 1, p 231.
5. Press, W. Single Particle Rotations in Molecular Crystals; Springer Tracts in Modern Physics, 92; Springer: Berlin, 1981.
6. Heidemann, A. New Methods in high resolution neutron spectroscopy. Physica 1994, B202, 207.
7. Carlile, C. J.; Penfold, J. The virtue of cold neutrons at pulsed sources. Neutron News 1995, 6, 5.
8. Sivia, D. S. From Bayes to tunnelling spectroscopy. Physica 1994, B202, 332.
9. Heidemann, A., Magerl, A., Prager, M., Richter, D., Springer, T., Eds. Quantum Aspects of Molecular Motions in Solids; Springer Proceedings in Physics Springer: Berlin, 1987; Vol. 17.
10. Carlile, C. J.; Horsewill, A. J. Proceedings of the international workshop "Quantum Molecular tunnelling in Solids" Physica 1994, B202, 207-373.
11. Fillaux, F.; Büttner, H. G.; Kearley, G. J.; Meinnel, J. Proceedings of the "International workshop on quantum tunnelling of atoms and molecules in solids", Grenoble 1995. Physica 1996, B226, 153-249.
12. Cavagnat, D. Methyl group reorientation in molecular crystals: present knowledge and perspectives. J. Chim. Phys. 1985, 82, 239.
13. Press, W. Rotational excitations in disordered molecular solids. In Dynamics of Molecular Crystals; Lascombe, J., Ed.; Elsevier: Amsterdam, 1987.
14. 4 II. Can. J. Chem. 1988, 66, 570.
15. Eckert, J. Dynamics of the molecular hydrogen ligand in mixed complexes. Spectrochim. Acta 1992, 48A, 363.
16. Thomas, R. K. Neutron scattering from adsorbed systems. In Progress in Solid State Chem.; Pergamon: Oxford, 1983; Vol. 14.
17. Langel, W. Inelastic neutron scattering from matrix isolated species. Spectrochimica Acta 1992, 48A, 405.
18. Horsewill, A. J. Rotational tunnelling in organic molecules. Spectrochimica Acta 1992, 48A, 379.
19. Prager, M. Rotational tunnelling after 15 years of neutron scattering. Physica 1991, B174, 218.
20. Carlile, C. J.; Prager, M. Rotational tunnelling spectroscopy with neutrons, Int. J. of Modern Physics 1993, B7, 3113.
21. Smith, D. Hindered rotation of the ammonium ion in the solid state. Chem. Rev. 1994, 94, 1567.
22. Neumann, M.; Johnson, M.; von Laue, L.; Trommsdorff, H. P. Proton tunnelling in molecular solids. J. Lum. 1995, 66-67, 146.
23. 2 in parahydrogen solid at 4.2K. J. Phys. Chem. 1991, 95, 26.
24. Horsewill, A. J.; McDonald, P. J.; Vijayaraghavan, D. Hydrogen bond dynamics in benzoic acid dimers as a function of hydrostatic pressure measured by nuclear magnetic resonance. J. Chem. Phys. 1994, 100, 1889.
25. Tomkinson, J.; Fillaux, F.; Kearley, G. J. Proton transfer: recent results from neutron vibrational spectroscopy. Physica 1996, B226, 213.
26. Cohen, R. C.; Saykally, R. J. Vibration-rotation-tunnelling spectroscopy of the van der Waals bond: A new look at intermolecular forces. J. Phys. Chem. 1992, 96, 1024.
27. Benderskii, V. A.; Makarov, D. E.; Wight, C. A. Chemical Dynamics at Low Temperatures; Advances in Chemical Physics John Wiley: New York, 1994; Vol. LXXXVIII.
28. Würger, A. From Coherent Tunneling to Relaxation: Dissipative Quantum Dynamics of Interacting Defects; Springer Tracts in Modern Physics; Springer: Berlin, 1997; Vol. 135.
29. Prager, M.; Heidemann, A. Tunnelling spectroscopy: compilation of available data. ILL internal report PR87T 1987.
30. Rudolph, H. D.; Seiler, H. Mikrowellenspektrum, Hinderungspotential der inneren Rotation und Dipolmoment des para-Fluorotoluols. Z. Naturforsch. 1965, 20a, 1682.
31. Das, T. Tunnelling through high periodic barriers. I. J. Chem. Phys. 1956, 25, 896.
32. Das, T. Tunnelling through high periodic barriers. II Application to nuclear magnetic resonance in solids. J. Chem. Phys. 1957, 27, 763.
33. 1 in solids. J. Chem. Phys. 1958, 28, 388.
34. Haupt, J.; Müller-Warmuth, W. Kernrelaxation und behinderte Rotation in organischen Festkörpern bei tiefen Temperaturen. Z. Naturforsch. 1968, 23a, 208.
35. Clough, S. Proton spin lattice relaxation due to tunnelling motion. J. Phys. 1971, C4, 2180.
36. + ion. Solid State Commun. 1972, 11, 679.
37. + in ammonium salts studied with NMR relaxation and inelastic neutron scattering. J. Phys. 1979, C12, 2177.
38. Köksal, F.; Rössler, E. Spin-lattice relaxation by tunnelling motions of methyl groups in some organic compounds. Solid State Commun. 1982, 44, 233.
39. Allen, P. S.; Cowking, A. Nuclear magnetic resonance study of hindered rotations in some methylbenzenes. J. Chem. Phys. 1968, 49, 789.
40. Emid, S.; Wind, R. A. On spin-lattice relaxation of tunnelling methyl groups. Chem. Phys. Lett. 1975, 33, 269.
41. Diezemann, G. High-field spin-lattice relaxation of methyl groups: relation to neutron scattering. J. Phys.: Condens. Matter 1992, 4, 9153.
42. Allen, P. S. Proton second moment of an isolated tunnelling methyl group. J. Chem. Phys. 1968, 48, 3031.
43. Allen, P. S.; Taylor, D. G. The temperature dependence of the NMR spectrum from protons in tunnelling methyl groups. J. Phys. 1975, C8, 3036.
44. Peternelij, J.; Hallworth, R. S.; Pintar, M. M. Semiclassical nalysis of the nuclear-magnetic-resonance absorption of a tetrahedrally coordinated four-spin-1/2 system. Phys. Rev. 1976, B14, 1863.
45. Lalowicz, Z. T.; McDowell, C. A.; Raghunathan, P. PMR spectroscopy of the tunnelling ammonium ion: Generalized line shape theory and some experimental examples. J. Chem. Phys. 1979, 70, 4819.
46. Clough, S. NMR Studies of molecular tunnelling; NMR - Basic principles and progress; Springer: Berlin, 1975; Vol. 13.
47. Freed, J. H. Quantum effects of methyl groups rotations in magnetic resonance: ESR splittings and linewidths. J. Chem. Phys. 1965, 43, 1710.
48. 4 through level crossing with paramagnetic impurities. Phys. Rev. Lett. 1972, 28, 871.
49. 3 groups in molecular crystals as studied by NMR spectra. Z. Naturforsch. 1988, 43a, 219.
50. 3 groups. Z. Phys. 1991, B83, 245.
51. Heuer, A. Quantum mechanical behaviour of deuterated methyl groups: The temperature dependence of NMR spectra and spin lattice relaxation times. Z. Phys. 1992, B88, 39.
52. 2H NMR studies for the examination of methyl group rotations between their classical and quantum mechanical limits. Z. Phys. 1993, B91, 65.
53. Hennel, J.; Birezynski, A.; Sagnowski, S. F.; Stachurowa, M. Theory of zero field NMR spectra. Effects of motion. Z. Phys. 1985, B60, 49.
54. White, M. A.; Morrison, J. A. Deductions about the structure of phase III from thermodynamic measurements on solid isotopic methanes. J. Chem. Phys. 1979, 70, 5384.
55. Inaba, A. Calorimetric studies of tunnelling phenomena. Physica 1994, B202, 325.
56. von Borczyskowski, C.; Oppenlander, A.; Trommsdorff, H. P.; Vial, J. C. Optical measurements of methyl group tunnelling and nuclear spin conversion. Phys. Rev. Lett. 1990, 65, 3277.
57. Borczyskowski, C.; Oppenlader, A.; Trommsdorff, H. P.; Vial, J.-C. Methyl group tunnelling in molecular crystals at low temperatures: A study via optical hole burning of the electronic state dependence and the relaxation dynamics. J. Lumin. 1991, 48-49, 178.
58. Trommsdorff, H. P.; von Borczyskowski, C.; Vial, C. Rotational and translational proton tunnelling and relaxation in condensed molecular systems. Mol. Cryst. Liq. Cryst. 1992, 216-218, 283.
59. Orth, K.; Schellenberg, P.; Friedrich, J.; Häusler, W. Symmetry species conversion in rotational tunnelling systems observed by hole burning: high resolution spectroscopy of dimethyl-s-tetrazine in n-octane. J. Lumin. 1993, 56, 99.
60. Johnson, M. R.; Frick, B.; Trommsdorff, H. P. A high resolution, inelastic neutron scattering investigation of tunnelling methyl groups in aspirin. Chem. Phys. Lett. 1996, 258, 187.
61. Trommsdorff, P.; Neumann, M.; Johnson, M.; Corval, A.; von Laue, L. Optical probes of proton tunnelling in molecular solids. Physica 1996, B226, 244.
62. Nelander, B. An infrared spectroscopic study of the rotation of methane in solid nitrogen. J. Chem. Phys. 1985, 82, 5340.
63. Blake, G. A.; Bumgarner, R. E. Direct measurement of the HCl dimer tunnelling rate and Cl isotope dependence by far-infrared laser sideband spectroscopy of planar superionic jet. J. Chem. Phys. 1989, 91, 7300.
64. 4 II from infrared spectroscopy. Chem. Phys. Lett 1989, 157, 11.
65. + ions in ammonium cobalt sulfate. J. Chem. Phys. 1987, 87, 1899.
66. Lister, D. G.; MacDonald, J. N.; Owen, N. L. Internal Rotation and Inversion; Academic Press: London, 1978.
67. Hecht, K. T.; Dennison, D. M. Hindered rotation in molecules with relatively high potential barriers. J. Chem. Phys. 1957, 26 31.
68. Herzberg, G. Molecular Spectra and Molecular Structure; van Nostrand: Cincinnati, 1966.
69. Orville-Thomas, W. J., Ed. Internal Rotation in Molecules; John Wiley: London, 1974.
70. Papoušek, D.; Aliev, M. R. Molecular Vibrational-Rotational Spectra; Elsevier: Amsterdam, 1982.
71. 3v rotors. In Vibrational Spectra and Structure; Durig, J., Ed.; Elsevier: Amsterdam, 1981; Vol. 9, Chapter 6.
72. Peternelj, J.; Kodeli, L; Pintar, M. M. Rotational tunnelling of methyl groups in a strong magnetic field. Can. J. Phys. 1989 67, 1085.
73. 2. J Chem. Phys. 1987, 86, 5989.
74. 6) Hofmann clathrate. J. Phys.: Condens. Matter 1990, 2, 3177.
75. Fillaux, F.; Carlile, C. J. Inelastic-neutron-scattering study of methyl tunnelling and the quantum sine-Gordon breather in isotopic mixtures of 4-methyl-pyridine at low temperature. Phys. Rev. 1990, B42, 5990.
76. Voll, G. Rotational tunnelling spectra for many coupled methyl rotors. Physica 1994, B202, 239.
77. 4-symmetrischen Potential. Thesis, Erlangen, 1995.
78. 4 -symmetric cage. Physica 1996, B222, 1.
79. Hüller, A. Coherent neutron scattering from the rotational states. Solid State Commun. 1977, 23, 765.
80. Clough, S.; McDonald, P. J. The number of spin symmetry species of tunnelling molecular groups. J. Phys. 1983, C15, 5753.
81. McHale, G.; Stevens, K. W. H. A group theoretical study of planar methyl rotation. J. Phys.: Condens. Matter 1990, 2, 7257.
82. Hüller, A. Rotational tunnelling in solids: The theory of neutron scattering, Phys. Rev. 1977, B16, 1844.
83. Matuschek, D.; Hüller, A. Neutron scattering cross section for methyl groups and tetrahedral molecules. Can. J. Chem. 1988, 66, 495.
84. Ozaki, Y. Q -dependence in neutron scattering of the methyl group within 3-fold and 6-fold potentials, J. Phys. Soc. Jpn. 1992, 61, 1823.
85. 3 D matrixisolated in argon and krypton. J. Chem. Phys. 1995, 103, 6880.
86. 3 D in rare gas crystals. Physica 1996, B226, 224.
87. Ozaki, Y. The field dependence of intensity of neutron scattering of a tetrahedral ion. J. Phys. Soc. Jpn. 1987, 56, 4190.
88. Clough, S.; Horsewill, A. J.; Alsanoosi, A. M.; Barlow, M. J.; Johnson, M. R. The spectrum of rotating wavepackets of hindered methyl groups. Chem. Phys. Lett. 1993, 211, 637.
89. Sutcliffe, J. H.; Clough, S. Rotational trajectories of methyl groups. Physica 1994, B202, 339.
90. Meinnel, J.; Carlile, C. J.; Knight, K. S.; Godard, J. Assignment of tunnelling lines by single crystal neutron spectroscopy Physica 1996, B226, 238.
91. Voll, G.; Hüller, A. A new method for calculating the rotational tunnelling splitting for three dimensional rotors. Can. J. Chem. 1988, 66, 925.
92. 3 rotational tunnelling in alkali acetates and correlation between NMR spin-lattice-relaxation and neutron scattering data. Z. Naturforsch. 1985, 40a, 596.
93. Clough, S.; Heidemann, A.; Horsewill, A.; Lewis, J. D.; Paley, M. N. J. The rate of thermally activated methyl group rotation in solids. J. Phys. 1982, C15, 2495.
94. Heidemann, A.; Anderson, I. S.; Jeffries, B.; Alefeld, B. Structure factors for neutron scattering on tunnelling methyl groups in nitromethane. Z. Phys. 1982, B49, 123.
95. Havighorst, M. Quantenmechanische Rotationen von Ammoniakmolekülen. Thesis, Aachen, 1995.
96. Smalley, M.; Hüller, A.; Thomas, R. K.; White, J. W. Rotational tunnelling of methane adsorbed on graphite. Mol. Phys. 1981, 44, 533.
97. Heidemann, A.; Anderson, I. S.; Prager, M.; Press, W. Experimental investigation of the inelastic neutron scattering structure factors of three dimensional rotators. Z. Phys. 1983, B51, 319.
98. 4 molecules in argon. J. Chem. Phys. 1989, 90, 400.
99. Langen, H.; Müller-Warmuth, W. NMR spin lattice relaxation and tunnelling of partially deuterated methyl groups. Z. Naturforsch. 1991, 46a, 1123.
100. Aibout, A.; Carlile, C. J.; Horsewill, A. J. The pressure dependence of tunnelling of coupled pairs of methyl groups in lithium acetate dihydrate. J. Phys.: Condens. Matter 1992, 4, 8903.
101. 2. J. Chem. Phys. 1982, 76, 2758.
102. Cavagnat, D.; Magerl, A.; Vettier, C.; Clough, S. Methyl tunnelling in α -crystallised toluene by inelastic neutron scattering: temperature and pressure effects. J. Phys. 1986, C19, 6665.
103. 2D systems. J. Chem. Phys. 1987, 87, 801.
104. Cavagnat, D.; Trevino, S. F.; Magerl, A. Effect of isotopic dilution in the methyl tunnelling spectra of molecular crystals. J. Phys.: Condens. Matter 1989, 1, 1047.
105. Heidemann, A.; Prager, M.; Monkenbusch, M. Methyl rotation in acetamide: the transition from quantum mechanical tunnelling to classical reorientation studied by inelastic neutron scattering. Z. Phys. 1989, B76, 77.
106. Heidemann, A.; Friedrich, H.; Günther, E.; Häusler, W. Tunnelling of coupled methyl groups in lithium acetate: the isotope effect. Z. Phys. 1989, B76, 335.
107. n as a function of composition (5 ≤ n ≤ 6.5). J. Phys. Chem. 1990, 94, 7300.
108. Orth, K.; Rohlfing, F.; Friedrich, J. Rotational tunnelling dynamics of methyl groups in n-alkane host lattices: an optical investigation of the internal and external isotope effect. Z. Phys. 1994, B95, 493.
109. 2 D group. J. Chem. Phys. 1973, 59, 623.
110. Asmussen, B.; Balszunat, D.; Press, W.; Prager, M.; Carlile, C. J.; Büttner, H. Quantum rotation of methane in argon: the isotope effect. Physica 1994, B202, 224.
111. Ball, P. C.; Inaba, A.; Morrison, J. A.; Smalley, M. V.; Thomas, R. K. The librational groundstate on monodeuteromethane adsorbed on the surface of graphite. J. Chem. Phys. 1990, 92, 1372.
112. Cavagnat, D.; Pesquer, M. Methyl group rotation in solid nitromethane: Theoretical calculation of the potential. J. Phys. Chem. 1986, 90, 3289.
113. Smith, D. The derivation of the rotational potential function from atom-atom potentials. II. Ammonium-fluorine compounds. J. Chem. Phys. 1987, 86, 4055.
114. Smith, D. The derivation of the rotational potential function from atom-atom potentials. III. Borohydride compounds. Can. J. Chem. 1988, 66, 791.
115. Smith, D. The derivation of the rotational potential function from atom-atom potentials. V. Hindered rotation of ammonia molecules in solid ammonia. J. Chem. Phys. 1990, 92, 4660.
116. Prager, M.; David, W. I. F.; Ibberson, R. M. Methyl rotational excitations in p-xylene: a test of pair interaction potentials. J. Chem. Phys. 1991, 95, 2473.
117. Rice, B. M.; Trevino, S. F. An intermolecular H-O potential for methyl rotations in solid nitromethane. J. Chem. Phys. 1991, 94, 7478.
118. Prager, M.; Wakabayashi, N.; Monkenbusch, M. Coupling the methyl group N-acetamide to phonons: a consistent view of tunnelling and lattice dynamics. Z. Phys. 1994, B94, 69.
119. Meinnel, J.; Mani, M.; Tonnard, F.; Nusimovici, M.; Sanquer, M. Potential seen by the methyls of the tribromo-mesitylene (Potentiel décélé par les methyles du tribromo-mesityléne). C. R. Acad. Sci. Paris 1993, 317, 885.
120. Hüller, A.; Raich, J. Torsional ground state splitting for the tetrahedral molecules. J. Chem. Phys. 1979, 71, 3851.
121. Clough, S.; Heidemann, A.; Paley, M.; Vettier, C. The pressure dependence of methyl tunnelling motion. J. Phys. 1979, C12, L781.
122. 6. J. Chem. Phys. 1984, 80, 2777.
123. Cavagnat, D.; Magerl, A.; Vettier, C.; Clough, S. Inelastic neutron scattering study of methyl tunnelling in α-crystallized toluene. In Springer Proceedings in Physics, Springer: Berlin, 1987; Vol. 17, p 24.
124. Prager, M.; Vettier, C.; Mahling-Ennanoui, S. The temperature dependence of the methyl rotational potential in methyl iodide under pressure. Z. Phys. 1989, B75, 217.
125. Johnson, M. R.; Trommsdorff, H. P. Rotational tunnelling studied by optical hole burning at high pressure. Physica 1996, B226, 194.
126. Würger, A. High temperature quantum effects in methyl rotation. Z. Phys. 1991, B84, 263.
127. Burrows, W.; Strauss, H. L. Kinetics of molecular tunnelling at intermediate temperature. J. Chem. Phys. 1993, 93, 7510.
128. Johnson, C. S.; Mottley, C. The temperature dependence of quantum mechanical tunnelling effects in the NMR spectrum of a methyl group. Chem. Phys. Lett. 1973, 22, 430.
129. Allen, P. S. A model for a temperature-dependent frequency distribution of methyl group tunnelling splittings, J. Phys. 1974, C7, L22.
130. Punkkinen, M. Methyl group tunnelling and coupling to internal vibrations. J. Phys. 1978, C11, 3039.
131. Clough, S. The temperature dependence of rotational tunnelling frequencies in molecular solids. J. Phys. 1976, C9, L523.
132. Clough, S. A kinetic theory of the temperature dependence of methyl tunnelling spectra. J. Phys. 1981, C14, 1009.
133. Clough, S.; Hill, J. R. Temperature dependence of methyl group tunnelling rotation frequency. J. Phys. 1973, C7, L20.
134. Hüller, A. The temperature dependence of rotational tunnelling. Z. Phys. 1980, B36, 215.
135. Punkkinen, M. Temperature dependence of the librational tunnelling and proton relaxation. Phys. Rev. 1980, B21, 54.
136. Häusler, W. Zur Temperaturabhängigkeit des Rotationstunnelns. Internal Report PTB-PG-3, Physikalisch Technische Bundesanstalt, 1990.
137. Clough, S.; Barker, G. J.; Abed, K. J.; Horsewill, A. J. Molecular friction and nuclear magnetism. Phys. Rev. Lett. 1988, 60, 136.
138. Würger, A. Rotational tunnelling and Kramers degeneracy. J. Phys.: Condens. Matter 1989, 1, 1673.
139. Hewson, A. C. The temperature dependence of inelastic neutron scattering in rotational tunnelling systems: I. Formulation and perturbation theory. The temperature dependence of inelastic neutron scattering in rotational tunnelling systems: II. Calculation of the time dependent correlation functions. J. Phys. 1982, C15, 3841 and 3855.
140. Whithall, M. W. G.; Gehring, G. A. Path integral approach to methyl group rotation. J. Phys. 1987, C20, 1619.
141. Hüller, A. Rotational tunnelling at finite temperatures: Substitution by an equivalent harmonic system. Z. Phys. 1990, B78, 125.
142. Vowe, A. The temperature dependence of rotational tunnelling, modelled with a harmonic system. J. Phys.: Condens. Matter 1993, 5, 8531.
143. Würger, A. The temperature dependence of inelastic rotational tunnelling lines. J. Phys.: Cond. Matter 1989, 1, 6901.
144. Würger, A. The temperature dependence of rotational tunnelling. Z. Phys. 1989, B76, 65.
145. Würger, A.; Hüller, A. Rotational tunnelling: The width of the quasi-elastic line. Z. Phys. 1990, B78, 479.
146. Hüller, A.; Baetz, L. The temperature dependence of rotational tunnelling - simulation of a quantum system at finite temperature; Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 2.
147. Hüller, A.; Baetz, L. Rotational tunnelling: A computer simulation at finite temperature. Z. Phys. 1988, B72, 47.
148. Deutsch, C.; Hüller, A. Quantum rotator under the influence of stochastic kicks. Physica 1994, B202, 320.
149. Hofmann, P.; Brickmann, J. Molecular dynamics simulation for an ensemble of coupled quantum two level systems with classical degrees of freedom. J. Chem. Phys. 1988, 88, 6501.
150. Braun, D.; Weiss, U. Dynamics of the damped rotational tunnelling system: The effect of librational excitations. Z. Phys. 1993, B92, 507.
151. Braun, D.; Weiss, U. Rotational Tunnelling and librational excitations: The loss of quantum coherence. Physica 1994, B202, 264.
152. Clough, S. The wrong side of the quantum track. New Sci. 1988, 24, 37.
153. Clough, S. The topology of methyl rotation and gauge theory in solids. Mol. Phys. 1989, 68, 1255.
154. Clough, S. Gauge theory, symmetry breaking and molecular rotation in crystals. Ber. Bunsen-Ges. Phys. Chem. 1989, 93, 1182.
155. Clough, S. Anyons and coherent methyl rotational spectroscopy. J. Mol. Liq. 1992, 54, 229.
156. Clough, S. Trajectory label quantum mechanics. Europhys. Lett. 1995, 32, 95.
157. Clough, S. Trajectories in methyl rotation. Physica 1996, B226, 228.
158. Clough, S.; Horsewill, A. J.; Johnson, M. R. Approximate rotational quantization and the Pauli principle. Chem. Phys. Lett. 1993, 208, 143.
159. Clough, S.; Horsewill, A. J.; Johnson, M. R. Approximate topology and the nonexistence of spin-symmetry species of hindered methyl groups. Phys. Rev. 1993, A47, 3420.
160. Clough, S. Coherent methyl dynamics. Physica 1994, B202, 256.
161. Clough, S. The rotational spectrum of tunnelling methyl groups. Z. Naturforsch. 1994, 49A, 1193.
162. Clough, S.; Horsewill, A. J.; Johnson, M. R.; Sutcliffe, J. H.; Tomsah, I. B. I. A molecular motor. Europhys. Lett. 1995, 29, 169.
163. Hüller, A.; Prager, M, Total neutron scatterring cross section for molecules in the torsional ground state multiplet. Solid State Commun. 1979, 29, 537.
164. Guckelsberger, K.; Friedrich, H.; Scherm, R. Spin species conversion of rotational tunnelling molecules studied by neutron transmission. Z. Phys. 1993, B91, 209.
165. Friedrich, H.; Grieger, S.; Guckelsberger, K.; Scherm, R.; Press, W. Measurement of total cross-section and spin conversion in solid methane. Physica 1996, B226, 218.
166. 3 quantum rotators. Physica 1996, B226, 234.
167. Häusler, W. Theory of spin conversion in XH3 - systems. Z. Phys. 1990, B81, 265.
168. Würger, A. Nuclear spin conversion of methyl groups. Z. Phys. 1990, B81, 273.
169. 3 systems. J. Phys.: Condens. Matter 1993, 5, 6121.
170. 3 systems. Physica 1994, B202, 246.
171. Diezemann, G.; Häusler, W. Symmetry species exchange in rotational tunnelling systems. Physica 1996, B226, 189.
172. Clough, S.; Horsewill, A. J.; Paley, M. N. J. Diffusion of methylgroup tunnelling energy. Phys. Rev. Lett. 1981, 46, 71.
173. Vuorimäki, A. H.; Punkkinen, M. Spin diffusion of methyl protons in sodium and lithium acetates. J. Phys.: Condens. Matter 1989, 2, 993.
174. + ion: a neutron scattering study. Spectrochim. Acta 1990, 46A, 911.
175. Grieger, S.; Friedrich, H.; Asmussen, B.; Guckelsberger, K.; Nettling, D.; Press, W.; Scherm, R. Nuclear spin conversion of methane in pure and rare-gas mixed crystals. Z. Phys. 1992, B87, 203.
176. Nijman, A. J.; Berlinsky, A. J. Theory of nuclear spin conversion in the β phase of solid methane. Phys. Rev. Lett. 1977, 38, 408.
177. 4. Can. J. Phys. 1980, 58, 1049.
178. Vandemaele, G.; Coppens, P.; van Gerven, L. New method to study spin conversion of a nuclear-spin rotor with low tunnel splitting. Phys. Rev. Lett. 1986, 56, 1202.
179. Hartmann, C.; Joyeux, M.; Trommsdorff, H. P.; Vial, J.-C.; von Borczyskowski, C. Optical measurements of methyl group tunnelling in molecular crystals: temperature dependence of the nuclear spin conversion rate. J. Chem. Phys. 1992, 96, 6335.
180. 3v rotors. J. Chem. Phys. 1980, 73, 3947.
181. Barker, G. J.; Clough, S. Tunnel spectroscopy of pairs of methyl groups. In Dynamics of Molecular Crystals; Lascombe, J., Ed.; Elsevier: Amsterdam, 1987; p 633.
182. Takeda, S.; Chihara, H. Coupled tunnelling of methyl groups in solids as studied by proton NMR methods. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 76.
183. 2-type dimers, J. Mol. Spectr. 1991, 149, 73.
184. Loeser, J. G.; Schmuttenmaer, C. A.; Cohen, R. C.; Elrod, M. J.; Seyert, D. W.; Bumgarner, R. E.; Blake, G. A. Multidimensional hydrogen tunnelling dynamics in the ground vibrational state of the ammonium dimers. J. Chem. Phys. 1992, 97, 4727.
185. 2. J. Chem. Phys. 1992, 97, 4750.
186. 4 molecules in weak orientational potentials of cubic symmetry. J. Chem. Phys. 1992, 97, 1332.
187. Clough, S.; Heidemann, A.; Horsewill, A. J.; Paley, M. N. J. Coupled tunnelling motion of a pair of methyl groups in lithium acetate studied by inelastic neutron scattering. Z. Phys. 1984, B55, 1.
188. Swalen, J. D.; Costain, C. C. Internal rotation in molecules with two internal rotors: Microwave spectrum of acetone. J. Chem. Phys. 1959, 31, 1562.
189. 2X -type molecules. J. Chem. Phys. 1962, 37, 1800.
190. 3X -type molecules. J. Chem. Phys. 1963, 39, 17.
191. Würger, A. Tunnelling splitting of coupled rotors in the Hartree approximation. Z. Phys. 1988, B70, 193.
192. Kornienko, I. A.; Umanski, S. Y. Generalized two state quantum model of weak nonadiabatic coupling with exponential interaction. Soviet J. Chem. Phys. 1990, 6, 2558.
193. Häusler, W.; Hüller, A. Tunnelling of coupled methyl groups. Z. Phys. 1985, B59, 177.
194. Würger, A. Rotational tunnelling of three coupled molecules. J. Phys.: Condens. Matter 1990, 2, 2411.
195. Häusler, W. Rotational tunnelling of N coupled methyl groups. J. Phys.: Condens. Matter 1992, 4, 2577.
196. Voll, G. Rotational tunnelling splitting of a chain of four coupled methyl groups. Z. Phys. 1993, B90, 455.
197. Timann, M.; Voll, G.; Häusler, W. Rotational tunnelling of orientationally coupled methyl groups: Molecular field approximation versus numerically exact solution. J. Chem. Phys 1994, 100, 8307.
198. Eyring, V.; Isheim, M.; Voll, G. A harmonic substitute model sheds light upon the rotational tunnelling spectrum of inifinitely many coupled methyl groups. Physica 1995, B212, 379.
199. 3 groups Z. Phys. 1985, B59, 293.
200. Groner, P. Large amplitude motion tunnelling parameters in effective rotational Hamiltonians from rotation - internal rotation theory. J. Mol. Spectrosc. 1992, 156, 164.
201. 3 groups in the low temperature limit. Phys. Rev. 1987, B36, 25.
202. 4 type molecules. Z. Phys. 1990, B79, 251.
203. Filiaux, F.; Carlile, C. J.; Kearley, G. J. Inelastic neutron scattering study at low temperature of the quantum sine-Gordon breather in 4-methyl-pyridine with partially deuterated methyl groups. Physica 1992, B180-181, 642.
204. Filiaux, F.; Carlile, C. J.; Kearley, G. J.; Prager, M. Inelastic neutron-scattering study of methyl tunnelling and the quantum sine-Gordon breather mode in isotopic mixtures of 2,6-dimethylpyridine at low temperature. Physica 1994, B202, 302.
205. 2 D groups and sine-Gordon dynamics. Physica 1996, B226, 241.
206. Carlile, C. J.; Clough, S.; Horsewill, A. J.; Smith, A. Observation of a dynamic coupling of methyl groups in 4-methylpyridine. Chem. Phys. 1989, 134, 437.
207. Schiebel, P.; Hoser, A.; Prandl, W.; Heger, G.; Paulus, W.; Schweiss, P. Proton density and orientational potential in nickel hexammine salts: a thermodynamic analysis of rotation-translation coupling. J. Phys.: Condens Matter 1994, 6, 10989.
208. 3 on the MgO{100} surface: spectroscopic evidence of coupled internal and centre of mass quantum rotation. Chem. Phys. Lett. 1996, 259, 1.
209. Havighorst, M.; Prager, M. Ammonia tunnelling in Hofmann clathrates: Consistent description by internal and centre of mass quantum rotation. Chem. Phys. Lett. 1996, 250, 232.
210. 2H NMR. Physica 1994, B202, 351.
211. 3 rotators. Phys. Rev. 1989, B39, 6374.
212. Peternelj, T. J.; Kanjc, T. Nonadiabatic screening of proton charges in the case of tunnelling methyl groups in external magnetic field. Z. Phys. 1993, B92, 61.
213. Peternelj, J.; Damyanovich, A.; Pintar, M. M. Time evolution of proton magnetization in the spin rotating frame of an ensemble of interacting pairs of methyl groups: A study of magnetic flux effect. Phys. Rev. 1994, B49, 3322.
214. Abed, K. J.; Barker, G. J.; Clough, S.; Horsewill, A. J. Tunnel spectroscopy by dipolar-driven NMR. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 65.
215. Abed, K. J.; Clough, S. Methyl tunnelling rotation in the n-alkanes. Chem. Phys. Lett. 1987, 142, 209.
216. 3 in a homologous series of ketones. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 28.
217. 3 in a homologous series of ketonee. In Dynamics of Molecular Crystals; Lascombe, J., Ed.; Elsevier: Amsterdam, 1987; p 535.
218. n with M = Sn, Pb, X = F, Cl, Br. Ber. Bunsen-Ges. Phys. Chem. 1989, 93, 1292.
219. Kubas, G. J. Chemical bonding of hydrogen molecules to transition metal complexes. J. Less Common Metals 1991, 172-174, 475.
220. 6. Physica 1994, B202, 360.
221. x. Mol. Phys. 1995, 86, 19.
222. 4II). J. Chem. Phys. 1982, 77, 2577.
223. Caciuffo, R.; Amoretti, G.; Carlile, C. J.; Filiaux, F.; Francescangeli, O.; Prager, M.; Ugozzoli, F. Methyl group tunnelling studies in calixarenes. Physica 1994, B202, 279.
224. Flygare, W. H. Molecular rotation in the solid state. Theory of rotation of trapped molecules in rare-gas lattices. J. Chem. Phys. 1963, 39, 2263.
225. King, H. F.; Hornig, D. F. Rotational states of a tetrahedron in a cubic crystal field. J. Chem. Phys. 1966, 44, 4520.
226. Smith, D. Tunnelling frequencies of ammonium ion in tetrahedral crystalline fields. J. Chem. Phys. 1975, 63, 5003.
227. Hüller, A.; Kroll, D. M. Rotational tunnelling in solids. J. Chem. Phys. 1975, 63, 4495.
228. Hüller, A.; Press, W. Rotational tunnelling in solids: Theory of neutron scattering II. Phys. Rev. 1981, B24, 17.
229. 3. Physica 1977, B92, 23.
230. Smalley, M. V.; Ball, P. C. The group theory of trigonal and tetragonal molecule rotation in trigonal and tetragonal crystal fields. Mol. Phys. 1991, 71, 1233.
231. + in crystalline fields of low symmetry. J. Chem. Phys. 1994, 100, 301.
232. Smith, D. Hindered rotational energy levels of a linear ion in octahedral and tetrahedral crystalline field. J. Chem. Phys. 1978, 68, 3222.
233. Kataoka, Y.; Okada, K.; Yamamoto, T. A quantum statistical study of a extended James-Keenan model as applied to solid methane. Chem. Phys. Lett. 1973, 19, 365.
234. Ozaki, Y.; Kataoka, Y.; Okada, K.; Yamamoto, T. Tunnelling states of a tetrahedral molecule in a tetrahedral field. J. Chem. Phys. 1980, 73, 4483.
235. 4 in solid Ar. J. Phys. Soc. Jpn. 1990, 59, 1277.
236. Smith, D. The tunnelling frequencies of the ammonium ion in its compounds. J. Chem. Phys. 1978, 68, 619.
237. Smith, D. Hindered rotational energy levels of the ammonium ion in alkali halide lattices. J. Chem. Phys. 1979, 71, 2498.
238. Smith, D. Hindered rotational energy levels of symmetric tops in trigonal crystalline fields. J. Chem. Phys. 1990, 92, 4669.
239. Smalley, M.; Ball, P. C. The group theory of trigonal and tetrahedral molecule rotations in trigonal and tetrahedral crystal fields. Mol. Phys. 1990, 71, 1233.
240. 4 adsorbed on NaCl(100) and LiF(100). Chem. Phys. Lett. 1994, 228, 379.
241. Moiseyev, N.; Lipkin, N.; Farrelly, D.; Atabek, O.; Leftevre, R. Determination of tunnelling rates in bound systems using the complex coordinate method. J. Chem. Phys. 1989, 91, 6246.
242. Skinner, J. L.; Trommsdorff, H. P. Proton transfer in benzoic acid crystals: A chemical soin-boson problem. Theoretical analysis of nuclear magnetic resonance, neutron scattering, and optical experiments. J. Chem. Phys. 1988, 89, 897.
243. 0.002. Europhys. Lett. 1988, 6, 535.
244. Lehmann, K. K. The interaction of rotation and local mode tunnelling in the overtone spectra of symmetrical hydrides. J. Chem. Phys. 1991, 95, 2361.
245. 4 eigenstates. J. Chem. Phys. 1992, 96, 7402.
246. Sokolov, N. D.; Vener, M. V. Proton tunnelling assisted by the intermolecular vibration excitation in the solid state. Chem. Phys. 1992, 168, 29.
247. 0.0002. Z. Phys. 1989, B76, 359.
248. Gloden, R. F. Eigenvalues of the Mathieu equation. EUR4349 and EUR4358, Euratom, 1970.
249. 4. Z. Naturforsch. 1984, 39a, 1187.
250. 3F. An inelastic neutron scattering study. J. Chem. Phys. 1988, 89, 1181.
251. Smith, D. Rotation of the methyl halides embedded in the rare gas solids. Low Temp. Phys. 1993, 19, 390.
252. Prager, M.; Stanislawski, J.; Häusler, W. Inelastic incoherent neutron scattering study of the methyl rotation in various methyl halides. J. Chem. Phys. 1987, 86, 2563.
253. 1 -analysis of methyl tunnelling in molecular crystals at intermediate barrier. Z. Naturforsch. 1987, 42a, 1266.
254. Prager, M.; Stanislawski, J.; Häusler, W. The methyl rotational potentials of various isotopic methyl iodides and their coupling to phonons. Springer Proceedings in Physics; 1987, 17, 107.
255. Cavagnat, D.; Magerl, A.; Vettier, C.; Anderson, I. S.; Trevino, S. F. Anomalous pressure dependence of the torsional levels in solid nitromethane. Phys. Rev. Lett. 1985, 54, 193.
256. Cavagnat, D.; Lascombe, J.; Lassegues, J. C.; Horsewill, A. J.; Heidemann, A.; Suck, J. B. Neutron and Raman scattering studies of the methyl dynamics in solid toluene and nitromethane. J. Physique 1984, 45, 97.
257. 2 with a threefold symmetric barrier. J. Phys. 1985, C18, 3407.
258. Cavagnat, D.; Magerl, A.; Trevino, S.; Pesquer, M.; Vettier, C. Neutron scattering study and theoretical calculations of the methyl group rotational potential in the solid nitromethane. In Dynamics of Molecular Crystals; Lascombe, J., Ed.; Elsevier: Amsterdam, 1987; p 649.
259. 3 groups in the hydroquinone/methanol clathrate: single crystal and powder deuterium NMR spectra. Chem. Phys. Lett. 1991, 186, 307.
260. Damyanovich, A. Z.; Peternelj, J.; Pintar, M. M. Observation of the ΔM=0 Clough tunnelling satellite in the normal and tilted rotating frame. Physica 1994, B202, 273.
261. Nicoll, D. W.; Pintar, M. M. Torsional spectroscopy from nuclear magnetization time evolution in the rotating frame. Phys. Rev. 1981, B23, 1064.
262. 3 tunnelling manifold by level crossing NMR. Phys. Rev. Lett. 1996, B76, 527.
263. Gradl, G.; Feis, A. Lorentzian antihole formation through optically induced spin conversion in doped n-octane crystals. J. Phys. Chem. 1992, 96, 2080.
264. Tilli, K. J.; Alefeld, B. Librational motions in dimethylacetylene studied by inelastic neutron scattering. Mol. Phys. 1978, 36, 287.
265. Batley, M.; Thomas, R. K.; Heidemann, A.; Overs, A.; White, J. Methyl group tunnelling and torsion in 2,4-hexadiyne. Mol. Phys. 1977, 34, 1771.
266. Cockbain, J. R.; Lechner, R.; Owen, M.; Thomas, R. K.; White, J. W. Methyl group rotation in hexadiyne. II. The transition from classical to quantum dynamics. Mol. Phys. 1982, 45, 1035.
267. Horsewill, A. J.; Green, R. M.; Alsanoosi, A. M. Methyl tunnelling in tiglic acid and 2-methyl-2-Butene. Chem. Phys. 1989, 138, 179.
268. Williams, J.; Shomany, E.; Reich, S.; Eisenberg, A. Methyl group tunnelling in viscoelastic relaxation: Experimental verification. Phys. Rev. Lett. 1975, 35, 951.
269. Williams, J.; Eisenberg, A. Methyl group tunnelling and viscoelastic relaxation in poly(methyl methacrylate). Macromolecules 1978, 11, 700.
270. Clough, S.; Horsewill, A. J.; McDonald, P. J. Methyl tunnelling spectroscopy and level crossing phenomena in solid acetone. J. Phys. 1984, C17, 1115.
271. Alsanoosi, A. M.; Horsewill, A. J. Methyl tunnelling in solid diacetyl. Chem. Phys. 1992, 160, 25.
272. McDonald, P. J.; Vijayaraghavan, D.; Debenham, P. M.; Horsewill, A. J. Pressure dependence of methyl tunnelling in solid diacetyl. An extension to the methyl thermometer model. Mol. Phys. 1993, 78, 219.
273. McDonald, P. J., Thesis, Nottingham, 1984.
274. 3 tunnelling sidebands of Δm=O studied by dipole-dipole driven low-field NMR in the frequency domain. J. Phys.: Condens. Matter 1989, 1, 10533.
275. Green, R. M.; Horsewill, A. J. A study of methyl group dynamics and barrier heights in a homologous series of unbranched ketones. Mol. Phys. 1986, 57, 887.
276. Horsewill, A. J.; Alsanoosi, A. M.; Carlile, C. J. Methyl tunnelling in acetylacetone. J. Phys. 1987, C20, L869.
277. Abed, K. J.; Clough, S.; Horsewill, A. J.; Mohammed, M. A. Methyl tunnelling rotation in a series of ketones. Chem. Phys. Lett. 1988, 147, 624.
278. Debenham, P. M.; Horsewill, A. J.; Tomsah, I. B. I.; Clough, S. Low-field NMR investigations of methyl tunnelling. Physica 1994, B202, 364.
279. Johnson, M. R.; Aibout, A.; Horsewill, A. J.; Williams, J. The pressure dependence of the methyl tunnelling in acetylacetone. J. Phys.: Condens. Matter 1993, 5, 7375.
280. Barlow, M. J.; Clough, S.; Horsewill, A. J.; Mohammed, M. A. Rotational frequencies of methyl group tunnelling. Solid State NMR 1992, 1, 197.
281. Alsanoosi, A. M.; Horsewill, A. J.; Clough, S. Methyl tunnelling spectroscopy in acetophenone. J. Phys.: Condens. Matter 1989, 1, 643.
282. Matsushita, M.; Momoseand, T.; Shida, T. Internal rotation of the methyl group in the radical cation of dimethyl ether. J. Chem. Phys. 1990, 47, 49.
283. Smith, D. Coupled methyl groups. Chem. Phys. Lett. 1992, 188, 349.
284. Clough, S.; Horsewill, A. J.; McDonald, P. J.; Zelaya, F. O. Molecular tunnelling measured by dipole-dipole driven nuclear magnetic resonance. Phys. Rev. Lett. 1985, 55, 1794.
285. Clough, S.; Horsewill, A. J.; Johnson, M. R.; Sutcliffe, J. H.; Tomsah, I. B. I. Rotational quantization of methyl groups in a rotating frame. Mol. Phys. 1994, 81, 975.
286. Johnson, M. R. Driven tunnelling: New methods in NMR spectroscopy. Physica 1994, B202, 215.
287. Choi, C.; Pintar, M. M. Observation of simultaneous symmetry breaking of two noninteracting methyl groups by level crossing NMR. Physica 1996, B226, 164.
288. Jahnke, T. K.; Müller-Warmuth, W.; Bennati, M. Anomalous proton relaxation, rotational tunnelling and barriers to methyl group rotation in solid acetyl halides. Solid State NMR 1995, 4, 153.
289. 3. Z. Naturforsch. 1995, 50a, 95.
290. 3 group. Physica 1996, B226, 161.
291. Clough, S.; Poldy, F. Tunnelling rotation rate of a weakly hindered methyl group. J. Phys. 1973, C6, 1953.
292. Barlow, M. J.; Clough, S.; Debenham, P. A.; Horsewill, A. J. Spin thermodynamics and methyl tunnelling. J. Phys.: Condens. Matter 1992, 4, 4165.
293. Clough, S.; Horsewill, A. J.; Johnson, M. R.; Tomsah, I. B. I. Resonant broadening of NMR line shapes of tunnelling methyl groups at level anticrossing. Mol. Phys. 1993, 78, 781.
294. Allen, P. S.; Branson, P.; A proton relaxation study of nearly free methyl rotors in lithium acetate. J. Phys. 1978, C11, L121.
295. Clough, S.; Heidemann, A.; Paley, M. N. J. Neutron scattering transitions between spin symmetry species of methyl groups. J. Phys. 1980, C13, 4009.
296. Heidemann, A.; Abed, K. J.; Barker, C. J.; Clough, S. Proton spin conversion of coupled methyl groups in lithium acetate studied by inelastic neutron scattering. Z. Phys. 1987, B66, 355.
297. Heidemann, A. Rotational tunnelling of coupled groups studied by inelastic neutron scattering. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17.
298. Heidemann, A.; Eckert, J.; Passell, L.; Häusler, W. Pressure dependence of tunnelling and librational modes of coupled methyl groups in lithium acetate. Z. Phys. 1987, B66, 75.
299. Heidemann, A.; Clough, S.; McDonald, P. J.; Horsewill, A. J.; Neumaier, K. Tunnelling motions of methyl groups in manganese acetate tetrahydrate. Z. Phys. 1985, B58, 141.
300. Clough, S.; Heidemann, A.; Paley, M. N. J.; Suck, J. B. Methyl tunnelling and torsion in acetates: The shape of the hindering potential. J. Phys. 1980, C13, 6599.
301. Clough, S.; Heidemann, A.; Paley, M. N. J. The temperature dependence of methyl tunnelling motion in three acetates. J. Phys. 1981, C14, 1001.
302. Coppens, P.; van Gerven, L.; Clough, S.; Horsewill, A. J. Methyl Zeeman-tunnel resonance and nuclear spin relaxation in copper acetate. J. Phys. 1983, C16, 567.
303. Vandemaele, G.; Buckenhoudt, A.; van Gerven, L. Zeemantunnel resonance line shapes in NMRRR investigations of rotational tunnelling. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 72.
304. Mahgoub, A. S.; Clough, S. Quantum tunnelling and hopping of methyl groups in cadmium acetate dihydrate. J. Phys. 1985, C18, 647.
305. Aibout, A. Rotational tunnelling in methyl acetate. Thesis, Nottingham, 1990.
306. 3. Physica 1996, B226, 174.
307. 4 from 0.4 to 285K: Spin interaction and tunnel-splitting of internal rotation of methyl groups. J. Phys. Chem. 1978, 39, 413.
308. Watanabe, S.; Abe, Y.; Yoshizaki, R. Proton spin lattice relaxation from tunnelling methyl groups in rhombohedral acetamide. J. Phys. Soc. Jpn. 1985, 54, 4061.
309. Prager, M.; Wakabayashi, N.; Monkenbusch, M. A consistent view of methyl rotational tunnelling and lattice dynamics in acetamide. Physica 1994, B202, 252.
310. Prager, M.; Monkenbusch, M.; Ibberson, R. M.; David, W. I. F.; Cavagnat, D. Methyl rotational potentials and transferable pair potentials in toluene. J. Chem. Phys. 1993, 98, 5653.
311. Haupt, J.; Müller-Warmuth, W. Kernrelaxation und Quanteneffekte bei der Methylgruppenrotation von festern Toluol und Toluolderivaten. Z. Naturforsch. 1969, 24a, 1066.
312. van der Putten, C.; Diezemann, G.; Fujara, F.; Hartmann, K.; Sillescu, H. Methyl group dynamics in α -crystallized toluene as studied by deuteron spin-lattice relaxation. J. Chem. Phys. 1992, 96, 1748.
313. Caciuffo, R.; Francescangeli, O.; Melone, S.; Prager, M.; Ugozzoli, F.; Andreeti, G. D.; Amoretti, G.; Coddens, G.; Blank, H. An almost free methyl quantum rotor in p-tert-butylcalix[4]areae-(1:1)toluene. Physica 1992, B180-181, 691.
314. Caciuffo, R.; Amoretti, G.; Filiaux, F.; Francescangeli, O.; Melone, S.; Prager, M.; Ugozzoli, F. A new class of compounds suited to study the torsional dynamics in the quantum regime: the calixarenens. Chem. Phys. Lett. 1993, 201, 427.
315. Prager, M.; Hempelmann, R.; Langen, H.; Müller-Warmuth, W. Methyl tunnelling and rotational potentials in solid xylenes and fluorotoluenes. J. Phys.: Condens. Matter 1990, 2, 8625.
316. Rudolph, H. D.; Trinkaus, A. Mikrowellenspektrum, Hinderung-spotential der inneren Rotation und Dipolmoment des meta-Fluorotoluols. Z. Naturforsch. 1968, 23a, 68.
317. Prager, M.; Caciuffo, R.; Amoretti, G.; Carlile, C. J.; Coddens, G.; Fillaux, F.; Francescangeli, O.; Ugozzoli, F. Molecular tunnelling in p-tert-butylcalix[4]arene(2:1)p-xylene. Mol. Phys. 1994, 81, 609.
318. Takeda, S.; Chihara, H. Methyl rotation in 1,2,4,5-tetramethylbenzene and tetramethylpyrazine in the solid state. Tunnelling spectra by proton NMR. J. Magn. Res. 1983, 54, 285.
319. Clough, S.; Horsewill, A. J.; Heidemann, A. Neutron scattering study of methyl tunnelling in pentamethylbenzene. Chem. Phys. Lett. 1981, 82, 264.
320. Gabrys, B.; van Gerven, L. Rotational tunnelling of methyl groups in pentamethylbenzene studied by NMR relaxation resonance. Chem. Phys. Lett. 1981, 82, 260.
321. Takeda, S.; Soda, G.; Chihara, H. Evidence of coupled rotational tunnel states of methyl groups of hexamethylbenzene by nuclear magnetic resonance. Solid. State Commun. 1980, 36, 445.
322. 2H NMR. Chem. Phys. Lett. 1991, 181, 563.
323. Meinnel, J.; Häusler, W.; Mani, M.; Tazi, M.; Sanquer, M.; Wyncke, B.; Heidemann, A.; Carlile, C. J.; Tomkinson, J.; Hennion, B. Methyl tunnelling in trihalogeno-trimethylbenzenes. Physica 1992, B180-181, 711.
324. Takeda, S.; Fujiwara, T.; Chihara, H. Methyl rotation in 1,3,5-trichloro-2,4,6-trimethylbenzene as studied by nuclear magnetic resonance: A comparison with methyl rotation in hexamethylbenzene. J. Phys. Soc. Jpn. 1989, 58, 1793.
325. Meinnel, J.; Mani, M.; Nusimovici, M.; Carlile, C. J.; Hennion, R.; Carrie, R.; Wyncke, B.; Sanquer, M.; Tonnard, F. Methyl tunnelling in pure and matrix isolated halogenomesitylenes. Physica 1994, B202, 293.
326. Meinnel, J.; Hennion, B.; Mani, M.; Wyncke, B.; Carlile, C. J. Methyl tunnelling in dibromomesitylene. Physica 1995, B213-214, 649.
327. Clough, S.; Heidemann, A.; Lichtenbelt, J. H.; Paley, M. N. J.; Silbey, R.; Trommsdorff, H. P.; Wiersma, D. A. Tunnelling of methyl groups in toluquinone: Dependence of the electronic state of the molecule. J. Chem. Phys. 1984, 81, 2879.
328. Clough, S.; Hennel, J. W. Evidence for thermal quenching of methyl-group tunnelling rotation. J. Phys. 1975, C8, 3115.
329. Clough, S.; Heidemann, A. A study of the temperature dependence of a methyl tunnelling spectrum by inelastic neutron scattering. J. Phys. 1979, C12, 761.
330. Clough, S.; Heidemann, A.; Kraxenberger, H. Torsional relaxation of methyl-group nuclear-spin-symmetry species. Phys. Rev. Lett. 1979, 42, 1298.
331. McDonald, P. J.; Horsewill, A. J.; Dunstan, D. J.; Hall, N. The pressure dependence of methyl tunnelling in MDBP from fieldcycling NMR spectroscopy. J. Phys.: Condens. Matter 1989, 1, 2441.
332. Bonon, F.; Brustolon, M.; Maniero, A. L.; Segre, U. An ENDOR study of the temperature dependence of methyl tunnelling. Chem. Phys. 1992, 161, 257.
333. 3 -quantumrotator in solid 4-methyl-pyridine by inelastic neutron scattering. J. Chem. Phys. 1975, 63, 4495.
334. Abed, K. J.; Clough, S.; Carlile, C. J.; Rosi, B.; Ward, R. C. The symmetry of the methyl hindering potential and the temperature independence of the tunnelling frequency in 4-methyl-pyridine. Chem. Phys. Lett. 1987, 141, 215.
335. le Calvé, N.; Cavagnat, D.; Filiaux, F. Neutron inelastic scattering of the methyl torsional mode in hydrogenated and deuterated 4-methyl-pyridine crystals at 5K. Chem. Phys. Lett. 1988, 146, 549.
336. Fillaux, F.; Carlile, C. J. Collective rotation of methyl groups in isotopic mixtures of 4-methyl-pyridine at low temperature Inelastic neutron scattering spectra. Chem. Phys. Lett. 1989, 162, 188.
337. Carlile, C. J.; Ibberson, R. M.; Filiaux, F.; Willis, B. T. M. The crystal structure of 4-methyl-pyridine at 4.5 K. Z. Krist. 1990, 193, 243.
338. 2D -pyridine. Physica 1982, B112, 309.
339. 4N with an original sixfold symmetric barrier. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 113.
340. Filiaux, F.; Carlile, C. J.; Kearley, G. J. Inelastic neutron scattering study at low temperature of the quantum sine-Gordon breather in 4-methyl-pyridine with partially deuterated methyl groups. Phys. Rev. 1991, B44, 12280.
341. Ikeda, S.; Watanabe, N.; Inoue, K.; Kiyanagi, Y.; Inaba, A.; Takeda, S.; Kanaya, T.; Shibata, K.; Kamiyama, T.; Izumi, Y.; Ozaki, Y.; Carlile, C. J. High resolution neutron spectrometer LAM-80ET and rotational tunnelling in 4-methylpyridine N-oxide. J. Phys. Soc. Jpn. 1991, 60, 3340.
342. Müller-Warmuth, W.; Schüler, R.; Prager, M.; Kollmar, A. Rotational tunnelling in methylpyridines as studied by NMR relaxation and inelastic neutron scattering. J. Chem. Phys. 1978, 69, 2382.
343. 1 and INS. In Neutron Inelastic Scattering; IAEA: Vienna, 1978; Vol. 1, p 311.
344. van Cleemput, M.; Horsewill, A. J.; van Gerven, L. An NMR investigation of the dynamics of a methyl group with tunnelling frequency 3.4 MHz. Physica 1994, B202, 311.
345. van Cleemput, M.; Buekenhoudt, A.; van Gerven, L.; Horsewill, A. J. Quantum and classical dynamics of a methyl group with tunnelling frequency 3.4 MHz studied by low field NMR. J. Chem. Phys. 1995, 103, 2787.
346. Montjoie, A. S.; Müller-Warmuth, W.; Stiller, H.; Stanislawski, J. Methyl group rotation and tunnelling in crystals of 5-membered ring molecules. Z. Naturforsch. 1987, 43a, 35.
347. Müller-Warmuth, W. NMR studies of quantum tunnelling and thermally activated motion of methyl groups in molecular crystals. In Dynamics of Molecular Crystals; Lascombe, J., Ed.; Elsevier: Amsterdam, 1987; p 625.
348. Gebhardt, V.; Orth, K.; Friedrich, J. Optical spectroscopy and ground state dynamics of methyl groups. J. Chem. Phys. 1996, 104, 942.
349. 4 by inelastic neutron scattering and nuclear magnetic resonance. Z. Phys. 1983, B51, 309.
350. Zhang, D.; Prager, M.; Weiss, A. Inter- and intramolecular interactions and rotational tunnelling of methyl groups in tetramethyltin. J. Chem. Phys. 1991, 94, 1765.
351. Prager, M.; Zhang, D.; Weiss, A. Molecular distortion, intermolecular interaction and rotational tunnelling in mixed tetramethyllead/tetramethyltin. Physica 1992, B180-181, 671.
352. Prager, M.; Zhang, D.; Weiss, A. Rotational tunnelling in binary tetramethylmetal mixtures. Z. Naturforsch. 1995, 50A, 405.
353. Müller-Warmuth, W.; Duprée, K. H.; Prager, M. Methyl tunnelling and reorientation in the solid tetramethyl compounds of silicon, germanium, tin and lead, and in methyl lithium. Z. Naturforsch. 1983, 39a, 66.
354. 4: An inelastic neutron scattering study of matrix isolated molecules. J. Chem. Phys. 1986, 85, 5279.
355. Prager, M.; Langel, W. Rotational tunnelling in matrix isolated molecules. In Dynamics in Molecular Crystals; Lascombe, J., Ed.; Elsevier: Amsterdam, 1987; p 635.
356. Langel, W.; Prager, M.; Schrems, O.; Knözinger, E. Rotational tunnelling of matrix isolated tetramethyl compounds. In Springer Proceedings in Physics, Springer: Berlin, 1987; Vol. 17, p 93.
357. 2: An inelastic neutron scattering study. Z. Phys. 1986, B64, 447.
358. Stanislawski, J.; Prager, M.; Häusler, W. Coupled quantum rotors in dimethyl-tin-dichloride: The isotope effect. Physica 1989, B156-157, 356.
359. van Wüllen, L.; Müller-Warmuth, W. Coupled methyl quantum rotation and its influence on the NMR spin-lattice-relaxation. Ber. Bunsen-Ges. Phys. Chem. 1989, 93, 1298.
360. 2: a neutron scattering study. Z. Phys. 1990, B80, 113.
361. Zhang, D.; Walz, L.; Prager, M.; Weiss, A. Rotational tunnelling of methyl groups in Bis(trimethyltin) sulfate dihydrate. Ber. Bunsen-Ges. Phys. Chem. 1987, 91, 1283.
362. Zhang, D.; Prager, M.; Dou, S.-Q.; Weiss, A. Crystal structure of bis(trimethyltin) selenate dihydrate and rotational tunnelling of the methyl groups. Z. Naturforsch. 1989, 44a, 151.
363. 19F nuclear magnetic resonance and quasielastic neutron scattering study. Z. Naturforsch. 1992, 47a, 689.
364. Kearley, G. J.; Blank, H.; Cockcroft, J. Tunnelling of ammine ligands in nickel hexaammine iodide. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 58.
365. 2. J. Chem. Phys. 1987, 87, 6809.
366. 3 quantum rotors. Physica 1991, B174, 233.
367. Press, W.; Prager, M. Rotational tunnelling in hexamine nickel halides by inelastic neutron scattering. J. Chem. Phys. 1977, 67, 5752.
368. 3, in metal hexammine ions. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 62.
369. 3. Ber. Bunsen-Ges. Phys. Chem. 1982, 86, 1097.
370. 3. Rev. Phys. Appl. 1984, 19, 755.
371. 6. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 103.
372. Leclercq, F.; Damay, P.; Chieux, P. Quantum and diffusional rotation of ammonia in hexaamminecalcium as observed by incoherent neutron scatterring. J. Phys. Chem. 1984, 88, 3886.
373. 6. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 266.
374. 6. In Springer Proceedings in Physics; Springer: Berlin, 1989; Vol. 37, p 266.
375. Nöldeke, C.; Press, W.; Asmussen, B.; Damay, P.; Leclercq, F.; Foukani, M.; Dianoux, J. Ammonia rotations in ytterbiumhexaammine. J. Chem. Phys. 1995, 102, 1122.
376. 6 at 20K. Chem. Phys. 1993, 176, 279.
377. 3 free rotors in Hofmann clathrates. Physica 1996, B226, 194.
378. Havighorst, M.; Prager, M.; Coddens, G. Rotational tunnelling of ammonia on MgO(100) surfaces. Chem. Phys. Lett. 1994, 222, 113.
379. 3 on MgO{100} surfaces and in Hofmann clathrates. Physica 1996, B226, 178.
380. 3 in rare gases: a neutron scattering study. Chem. Phys. Lett. 1990, 173, 524.
381. 2 matrices. Physica 1992, B180-181, 674.
382. n in argon matrices. Physica 1994, B202, 355.
383. 3: Intermolecular vibrations and effective angular potential energy surface. J. Chem. Phys. 1991, 95, 9.
384. 3. Chem. Phys. 1991, 151, 407.
385. Havenith, M.; Cohen, R. C.; Busarow, K. L.; Gwo, D.-H.; Lee, Y. T.; Saykally, R. J. Measurement of the intermolecular vibrationrotation-tunnelling spectrum of the ammonia dimer by tunable far infrared laser spectroscopy. J. Chem. Phys. 1991, 94, 4776.
386. Heineking, N.; Stahl, W.; Olthof, E. H. T.; Wormer, P. E. S.; van der Avoird, A. The nuclear quadrupole coupling constant and the structure of the para-para ammonia dimer. J. Chem. Phys. 1995, 102, 8693.
387. Carlile, C. J.; McL. Jamie, I.; White, J. W.; Prager, M.; Stead, W. Rotational tunnelling of ammonia in two-dimensional metalammonia solutions. J. Chem. Soc. Faraday Trans. 1991, 87, 73.
388. x. Mol. Phys. 1992, 76, 173.
389. Prager, M.; Svare, I. Tunnel splittings in ammonium hexachlorides. J. Phys. 1983, C16, L181.
390. Smith, D. The derivation of the rotational potential function from atom-atom potentials. I. Ammonium-chlorine compounds. J. Chem. Phys. 1985, 82, 5133.
391. 6. J. Phys. 1979, C12, 4051.
392. 6 by inelastic neutron scattering. J. Chem. Phys. 1977, 67, 5126.
393. Smith, D. Activation energies and tunnelling frequencies of ammonium halides and ammonium hexachlorides. J. Chem. Phys. 1981, 74, 6480.
394. Müller, T. W.; Hüller, A. The rotational potential in the ammonium hexahalometallates. J. Phys. 1982, C15, 7295.
395. 6 single crystals: I. Tunnelling frequency measurements. Z. Phys. 1987, B66, 363.
396. 6. J. Chem. Phys. 1988, 88, 58.
397. 6 single crystal: II T level structure. Z. Phys. 1990, B80, 104.
398. 6 single crystal: III Low magnetic field measurements. Z. Phys. 1990, B81, 175.
399. 6 below 60 K. Physica 1990, B162, 281.
400. 3D in various crystalline environments. Chem. Phys. 1992, 164, 407.
401. 6. Chem. Phys. Lett. 1975, 36, 393.
402. Svare, I. Temperature dependence of tunnelling frequency in ammonium lead hexachloride. J. Phys. 1979, C12, 3907.
403. 6 by inelastic neutron scattering spectroscopy. J. Chem. Phys. 1988, 89, 1199.
404. 6. Z. Naturforsch. 1995, 50A, 373.
405. Prager, M.; Press, W.; Roessler, K. Rotational tunnelling of tetrahedral molecules in mixed crystals: neutron spectroscopy. J. Mol. Struct. 1980, 60, 173.
406. 6. J. Chem. Soc., Chem. Commun. 1986, 1986, 1738.
407. 6 lattices. Chem. Phys. 1997, 214, 425.
408. Svare, I.; Proton tunnelling frequencies in ammonium salts from spin-lattice relaxation. J. Phys. 1977, C10, 4137.
409. Lalowicz, Z. T. Proton NMR lineshapes of ammonium ions undergoing slow tunnelling rotations. Acta Phys. Polon. 1979, A56, 243.
410. Sharp, A. R.; Pintar, M. M. Cross relaxation dispersion and temperature dependence of nuclear spin dipolar and rotating frame Zeeman energies: A study of ammonium halides. J. Chem. Phys. 1981, 75, 2652.
411. + in dilute solution in alkali halide lattices: I. Inelastic neutron scattering studies. J. Phys. Soc. Jpn. 1983, 52, 2401.
412. x mixed crystals: A neutron scattering study. J. Chem. Phys. 1989, 91, 6337.
413. 1-xI. Pramana 1993, 40, L329.
414. + in KBr crystals. A complementary study by inelastic neutron scattering and calorimetric measurements. J. Phys. Soc. Jpn. 1990, 59, 522.
415. Mukhopadhyay, R.; Tomkinson, J.; Carlile, C. J. Rotational excitations in mixed ammonium potassium halides: a neutron scattering study. Europhys. Lett. 1992, 17, 201.
416. Mukhopadhyay, R.; Tomkinson, J.; Carlile, C. J. Nuclear spin conversion in the mixed ammonium-alkali halide systems: Time resolved inelastic neutron scattering study. Physica 1996, B226, 171.
417. + in KBr. J. Phys. Soc. Jpn. 1985, 54, 2595.
418. + ions in ammonium-alkali metal halide mixtures. Physica 1994, B202, 287.
419. 4 measured by inelastic neutron scattering (INS). In Magnetic Resonance and Related Phenomena; Brunner, H. B., et al., Eds.; Groupement Ampère: Heidelberg, 1976; p 389.
420. 4: Reanalysis of neutron spectra. J. Chem. Phys. 1981, 75, 494.
421. + at low temperatures. J. Phys. 1981, C14, L147.
422. + ions in ammonium perchlorate: The N-D stretching bands of different sites. J. Chem. Phys. 1993, 98, 4437.
423. Smith, D. The derivation of the rotational potential function from atom-atom potentials. VI. Ammonium-oxygen compounds Low Temp. Phys. 1993, 19, 394.
424. 4. J. Phys. 1983, C16, 2363.
425. 4 single crystal at low temperatures. Solid State NMR 1992, 1, 329.
426. 4. J. Phys. 1985, C18, 5033.
427. 4. Physica 1994, B202, 343.
428. Roberts, M. P.; Clavell-Grunbaum, D.; Strauss, H. L. The libration-vibration bands of ammonium ion in ammonium tetraphenylborate: evidence for nearly free rotation. J. Chem. Phys 1987, 87, 6393.
429. Roberts, M. P.; Lucazeau, G.; Kearley, G. J.; Dianoux, A. J. Quantum rotation of the ammonium ions in tetraphenyl-borate: Inelastic neutron scattering. J. Chem. Phys. 1990, 93, 8963.
430. + ion in tetraphenyl-borate. IV. Raman studies. J. Chem. Phys 1990, 93, 7632.
431. 4. J. Chem. Phys. 1990, 93, 8524.
432. 4 crystals. Physica 1990, B164, 313.
433. 4 crystals at low temperatures. J. Phys. Chem. 1987, 91, 4241.
434. Burrows, W.; Strauss, H. L. Kinetics of molecular tunnelling at intermediate temperatures. J. Chem. Phys. 1990, 93, 7510.
435. + in Tutton salt: Equilibrium orientation and tunnelling kinetics. J. Am. Chem. Soc. 1989, 111, 910.
436. Weier, J. E.; Strauss, H. L. The rotational tunnelling dynamics of the ammonium ion in ammonium nitrate. J. Chem. Phys. 1992, 96, 8799.
437. 4 mixed crystals. J. Chem. Phys. 1993, 98, 2274.
438. Cho, H. G.; Strauss, H. L. Persistent infrared hole-burning in poly(ammonium styrene sulfonate). J. Chem. Phys. 1993, 99, 5661.
439. 4 rotation studied by NMR level crossing spectroscopy. Chem. Phys. 1991, 152, 343.
440. 4 in the ground vibrational state. J. Chem. Phys. 1991, 94, 7707.
441. 4. J. Mol. Spectrosc. 1992, 153, 447.
442. 4. J. Chem. Phys. 1977, 66, 2701.
443. 4. J. Chem. Phys. 1980, 73, 3442.
444. 4 with high resolution neutron scattering. J. Chem. Phys. 1981, 75, 4003.
445. 4 at temperatures below 1 K studied by inelastic neutron scattering. J. Chem. Phys. 1984, 81, 5799.
446. 4 II in the meV range studied by inelastic neutron scattering. Can. J. Chem. 1988, 66, 686.
447. Smith, D. Librational and tunnelling frequencies in solid methane. J. Chem. Phys. 1990, 93, 10.
448. 4. J. Chem. Phys. 1981, 75, 1442.
449. 4. J. Chem. Phys. 1989, 91, 6737.
450. 3D molecules in the phase II structure of solid methane. J. Chem. Phys. 1983, 78, 383.
451. Lushington, K. J.; Maki, K.; Morrison, J. A.; Heidemann, A.; Press, W. Tunnelling states in phase III of solid partially deuterated methanes. Determination by inelastic neutron scattering and correlation with thermodynamic data. J. Chem. Phys. 1981, 75, 4010.
452. 4. Phys. Rev. 1978, B17, 2124.
453. Takeda, S.; Chihara, H. Proton NMR and tunnelling of methyl groups in γ phase of tetramethylsilane. J. Phys. Soc. Jpn. 1985, 54, 3690.
454. 4 and GeH4. Solid State Commun. 1990, 75, 189.
455. 4. J. Chem. Phys. 1991, 94, 52.
456. 4 and Kr. J. Chem. Phys. 1986, 85, 2204.
457. 4 II: Effect of Kr impurities. J. Chem. Phys. 1987, 86, 6465.
458. 4 impurities in solid rare gas matrices (Ar, Kr, Xe). In Neutron Inelastic Scattering; IAEA: Vienna, 1978; Vol. 1, p 311.
459. Nishiyama, K.; Yamamoto, T. Theory of phase transitions in solid methane. IX. The Infrared absorption of methane in rare gas matrices. J. Chem. Phys. 1973, 58, 1001.
460. Prager, M.; Langel, W. Rotational excitations of methane molecules in a nonequilibrium krypton matrix. J. Chem. Phys. 1989, 90, 5889.
461. 4/krypton mixtures. J. Chem. Phys. 1993, 98, 158.
462. Prager, M.; Langel, W. Methane in vapor deposited argon: An inelastic neutron scattering study. J. Chem. Phys. 1988, 88, 7995.
463. 4/Ar mixtures. J. Chem. Phys. 1991, 95, 569.
464. 3 matrix-isolated in argon. J. Chem. Phys. 1996, 105, 1763.
465. 4 in a tetrahedral site in a Xe matrix. J. Mol. Structure 1989, 194, 83.
466. 4/xenon. J. Chem. Phys. 1993, 99, 2052.
467. Prager, M.; Asmussen, B. Carlile, C. J. Methanein neon: nearly free rotation in a mismatched guest-host system. J. Chem. Phys. 1994, 100, 247.
468. c systems. J. Chem. Phys. 1990, 92, 5517.
469. Langel, W.; Prager, M.; Fleger, H. W.; Knözinger, E.; Lauter, H. J.; Blank, H.; Carlile, C. J. Methane tunnelling in disordered solid argon-nitrogen phases. J. Chem. Phys. 1993, 98, 4838.
470. Newbery, N. W.; Rayment, T.; Smalley, M. V.; Thomas, R. K.; White, J. W. Rotational tunnelling of methane on the surfaces of graphitized carbon blacks studied by neutron scattering spectroscopy. Chem. Phys. Lett. 1978, 59, 461.
471. Bomchil, G.; Hüller, A.; Rayment, T.; Roser, S. J.; Smalley, M. V.; Thomas, R. K.; White, J. W. The structure and dynamics of methane adsorbed on graphite. Philos. Trans. R. Soc. London 1980, B290, 537.
472. Nozé, S.; Ozaki, Y.; Maki, K.; Kataoka, Y. Rotational tunnelling of methane on the surface of graphite. Int. J. Quantum Chem. 1980, 18, 641.
473. Humes, R. P.; Smalley, M. V.; Rayment, T.; Thomas, R. K. Neutron inelastic scattering spectra of methane on graphite at the commensurate-incommensurate phase transition. Can. J. Chem. 1988, 66, 557.
474. Inaba, A.; Ikeda, S.; Skarbek, J.; Thomas, R. K.; Carlile, C. J.; Sivia, D. S. Rotational tunnelling and spin conversion in methane monolayers adsorbed on the surface of graphite. Physica 1995, B213, 643.
475. 3D physisorbed on the surface of graphite. J. Chem. Phys. 1981, 74, 2049.
476. Collinson, S. J. M.; Hunt, G. M.; Smalley, M. V.; Statham, M. L.; Thomas, R. K. Hindered rotation and tunnelling of adsorbed species. In Springer Proceedings in Physics; Springer: Berlin, 1987; Vol. 17, p 86.
477. Allen, M. P.; Hovenden, C. B.; Humes, R. P.; Mehta, S. K.; Thomas, R. K.; White, M. A. Neutron-scattering spectra from the hindered rotation of methane in methane-krypton mixtures adsorbed on graphite, Faraday Discuss. Chem. Soc. 1985, 80, 171.
478. Larese, J. Z.; Hastings, J. M.; Passell, L.; Smith, D.; Richter, D. Rotational tunnelling of methane on MgO surfaces: A neutron scattering study. J. Chem. Phys. 1991, 95, 6997.
479. Larese, J. Z.; Asmussen, B.; Adams, M. A.; Carlile, C. J.; Martin, D.; Ferrand, M. Rotational tuneling studies of methane films adsorbed on MgO: crossover from two-to-three dimensions?. Physica 1996, B226, 221.
480. 4). J. Chem. Soc., Faraday Trans. 2, 1988, 84, 791.
481. 4). J. Chem. Soc., Faraday Trans. 2, 1988, 84, 813.
482. 4). J. Chem. Soc., Faraday Trans. 2, 1988, 84, 861.
483. 4). J. Chem. Soc., Faraday Trans. 2, 1988, 84, 841.
484. Balszunat, D.; Asmussen, B.; Müller, M.; Press, W.; Langel, W.; Coddens, G.; Ferrand, M.; Büttner, H. Rotational excitations of methane molecules in porous media. Physica 1996, B226, 185.
485. x. Mol. Phys. 1981, 44, 1257.
486. Jackson, I. P.; White, J. W. Domain mobility and rotational tunnelling of hydrogen in graphite intercalates. Chem. Phys. Lett. 1987, 134, 397.
487. Langel, W. Inelastic neutron scattering of hydrogen trapped in solid argon. Rev. Phys. Appl. 1984, 19, 755.
488. Nicol, J. M.; Eckert, J.; Howard, J. Dynamics of molecular hydrogen adsorbed in CoNa-A zeolite. J. Phys. Chem. 1988, 92, 7117.
489. 2) (M = W, Mo; R = Cy, i - Pr): Inelastic neutron scattering, theoretical and molecular mechanics studies. J. Am. Chem. Soc. 1990, 112, 2324.
490. Eckert, J.; Kubas, G. J. Barrier to rotation of dihydrogen ligand in metal complexes. J. Phys. Chem. 1993, 97, 2378.
491. 2 in a tungsten complex. J. Chem. Phys. 1988, 88, 466.
492. 2), a complex with an unusually high difference in solid and solution-state stabilities. Inorg. Chem. 1993, 31, 1550.
493. 4 in the solid state as revealed by neutron-scattering experiments. Inorg. Chem. 1990, 29, 748.
494. 3 (M = Fe, Ru): Evidence for stronger back-donation in the iron complex. Inorg. Chem. 1992, 31, 4241.
495. 2. J. Am. Chem. Soc. 1993, 115, 11056.
496. 2. J. Chem. Phys. 1989, 91, 5154.
497. Bunker, P. R.; Epa, V. C.; Jensen, P.; Karpfen, A. An analytical ab initio potential surface and the calculated tunnelling energies for the HCl dimers. J. Mol. Spectrosc. 1991, 146, 200.
498. 2S- in KCl. Phys. Rev. 1986, B33, 25.
499. 2 van der Waals complex. J. Chem. Phys. 1990, 92, 6408.
500. 2Hc-HCl dimer. J. Chem. Phys. 1991, 95, 1552.
501. Takeda, S.; Kataoka, H.; Shibata, K.; Ikeda, S.; Matsuo, T.; Carlile, C. J. Quantum precession of HCl molecule in hydroquinone clathrate. Physica 1994, B202, 315.
502. 2. J. Mol. Spectrosc. 1991, 148, 385.
503. 2 on a six-dimensional potential hypersurface. Chem. Phys. Lett. 1995, 234, 71.
504. α = 0 → 1) submillimeter rotation-tunnelling spectrum of the water dimer. Chem. Phys. Lett. 1990, 166, 500.
505. 2. Chem. Phys. Lett. 1990, 173, 115.
506. Zwart, E.; ter Meulen, J. J.; Meerts, W. L.; Coudert, L. H. The submillimeter rotation tunnelling spectra of the water dimer. J. Mol. Spectrosc. 1991, 147, 27.
507. Pugliano, N.; Saykally, R. J. Measurement of quantum tunnelling between chiral isomers of the cyclic water trimer. Science 1992, 257, 1937.
508. Backens, M.; Kanert, O.; Kuchler, R. Uncommon temperature dependence of the rotational motion of OH- centers in NaCl. Radiation Eff. Defects Solids 1991, 119, 657.
509. 2O: investigation of the water tunnelling potential. Chem. Phys. Lett. 1991, 176, 123.
510. 2O isolated in solid argon. Chem. Phys. Lett. 1986, 124, 44.
511. Knözinger, E.; Schuller, W.; Langel, W. Structure and dynamics in pure and doped rar-gas matrices. Faraday Discuss. Chem. Soc. 1988, 86, 285.
512. 2 van der Waals complex. J. Mol. Spectr. 1991, 147, 46.
513. 2. Theoret. Chim. Acta 1991, 78, 133.
514. 2. J. Chem. Phys. 1993, 98, 988.
515. 1ρ-relaxation time, J. Chem. Soc., Faraday Trans. 2 1979, 75, 752.
516. Cannelli, G.; Cantelli, R.; Cordero, F. H-tunnelling and trapping in Ta by anelastic relaxation measurements. Phys. Rev. 1987, B35, 7264.
517. Cannelli, G.; Cantelli, R.; Cordero, F.; Trequattrini, F. H- tunnelling and trapping in Y by anelastic relaxation measure ments. Phys. Rev. Lett. 1991, 67, 2682.
518. y. Physica 1996, B226, 210.
519. Cannelli, G.; Cantelli, R.; Cordero, F.; Trequattrini, F. Four-level tunnel system of H trapped by a substitutional impurity in Nb. Physica 1994, B202, 229.
520. Black, B.; Majer, G.; Pines, A. SQUID-NMR study of the methyl tunnelling in a series of carboxylic acids. Chem. Phys. Lett. 1993, 201, 550.
521. McDonald, P. J.; Vijayaraghavan, D.; Debenham, P. M.; Horsewill, A. J. The pressure dependence of molecular dynamics measured by NMR. Physica 1994, B202, 346.
522. Brougham, D. F.; Horsewill, A. J.; Ikram, A.; Ibberson, R. M.; McDonald, P. J.; Pinter-Krainer, M. The correlation between hydrogen bond tunnelling dynamics and the structure of benzoic acid dimers. J. Chem. Phys. 1996, 105, 979.
523. Horsewill, A. J.; Ikram, A. Experimental invstigation of the quantum dynamics of the hydrogen bond using single crystal NMR. Physica 1996, B226, 202.
524. Horsewill, A. J.; Ikram, A.; Tomsah, I. B. I. Hydrogen bond dynamics in tetrafluoroterephtalic acid studied by NMR and INS. Mol. Phys. 1995, 84, 1257.
525. 2. J. Chem. Phys. 1987, 86, 5989.
526. 2. Can. J. Chem. 1988, 66, 692.