Cooling, trap loading, and beam production using a cryogenic helium buffer gas

Cold Molecules: Theory, Experiment, Applications

Volumn , Issue , 2009, Pages 473-508

  Campbell, Wesley C ^a   Doyle, John M ^a  

^a HARVARD UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

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EID: 85020312148     PISSN: None     EISSN: None     Source Type: Book    
DOI: None     Document Type: Chapter

References (78)

1. Migdall, A.L., Prodan, J.V., Phillips, W.D., Bergeman, T.H., and Metcalf, H.J., First observation of magnetically trapped neutral atoms, Phys. Rev. Lett., 54, 2596–2599, 1985.
2. Doyle, J.M., Friedrich, B., Kim, J., and Patterson, D., Buffer-gas loading of atoms and molecules into a magnetic trap, Phys. Rev. A, 52(4), R2515–R2518, 1995.
3. Kim, J., Friedrich, B., Katz, D.P., Patterson, D., Weinstein, J.D., deCarvalho, R., and Doyle, J.M., Buffer-gas loading and magnetic trapping of atomic europium, Phys. Rev. Lett., 78, 3665, 1997.
4. Weinstein, J.D., deCarvalho, R., Guillet, T., Friedrich, B., and Doyle, J.M., Magnetic trapping of calcium monohydride molecules at milikelvin temperatures, Nature, 395, 148, 1998.
5. Weinstein, J.D., deCarvalho, R., Hancox, C.I., and Doyle, J.M., Evaporative cooling of atomic chromium, Phys. Rev. A, 65, 021604(R), 2002.
6. Campbell, W.C., Tsikata, E., Lu, H.-I., van Buuren, L.D., and Doyle, J.M., Magnetic trapping and Zeeman relaxation of NH (X3Σ −), Phys. Rev. Lett., 98, 213001, 2007.
7. Huang, Y.H. and Chen, G.B., A practical vapor pressure equation for helium-3 from 0.01K to the critical point, Cryogenics, 46(12), 833–839, 2006.
8. Pobell, F., Matter and Methods at Low Temperatures, 2nd ed., Springer, 1996.
9. Hatakeyama, A., Enomoto, K., Sugimoto, N., andYabuzaki, T., Atomic alkali–metal gas cells at liquid–helium temperatures: Loading by light-induced atom desorption, Phys. Rev. A, 65, 022904, 2002.
10. Messer, J.K. and De Lucia, F.C., Measurement of pressure-broadening parameters for the CO–He system at 4K, Phys. Rev. Lett., 53(27), 2555–2558, 1984.
11. Doret, S., Connolly, C., and Doyle, J.M., Ultracold metastable helium, 2008. Unpublished.
12. Forrey, R.C., Kharchenko, V., Balakrishnan, N., and Dalgarno, A., Vibrational relaxation of trapped molecules, Phys. Rev. A, 59(3), 2146–2152, 1999.
13. Ball, C.D. and De Lucia, F.C., Direct measurement of rotationally inelastic cross sections at astrophysical and quantum collisional temperatures, Phys. Rev. Lett., 81(2), 305–308, 1998.
14. Ball, C.D. and De Lucia, F.C., Direct observation ofΛ-doublet and hyperfine branching ratios for rotationally inelastic collisions of NO–He at 4.2 K, Chem. Phys. Lett., 300, 227, 1999.
15. Mengel, M. and De Lucia, F.C., Helium and hydrogen induced rotational relaxation of H2COobserved at temperatures of the interstellar medium, Astrophys. J., 543, 271–274, 2000.
16. Campbell, W.C., Groenenboom, G.C., Lu, H.-I., Tsikata, E., and Doyle, J.M., Timedomain measurement of spontaneous vibrational decay of magnetically trapped NH, Phys. Rev. Lett., 100, 083003, 2008.
17. Hasted, J.B., Physics of Atomic Collisions, 2nd ed., chap. 1.6, American Elsevier Publishing Company, 1972.
18. Weinstein, J.D., Magnetic trapping of atomic chromium and molecular calcium monohydride, Ph.D. thesis, Harvard University, 2001.
19. Harris, J.G.E., Michniak, R.A., Nguyen, S.V., Brahms, N., Ketterle, W., and Doyle, J.M., Buffer gas cooling and trapping of atoms with small effective magnetic moments, Europhys. Lett., 67(2), 198–204, 2004.
20. Michniak, R., Enhanced buffer gas loading: Cooling and trapping of atoms with low effective magnetic moments, Ph.D. thesis, Harvard University, 2004.
21. Walker, T.G. and Happer, W., Spin-exchange optical pumping of noble-gas nuclei, Rev. Mod. Phys., 69(2), 629–641, 1997.
22. Johnson, C., Brahms, N., Newman, B., Doyle, J., Kleppner, D., and Greytak, T., Zeeman relaxation of cold atomic Fe and Ni in collisions with 3He, in preparation, 2008.
23. Krems, R.V. and Dalgarno, A., Disalignment transitions in cold collisions of 3P atoms with structureless targets in a magnetic field, Phys. Rev. A, 68, 013406, 2003.
24. Kokoouline, V., Santra, R., and Greene, C.H., Multichannel cold collisions between metastable Sr atoms, Phys. Rev. Lett., 90(25), 253201, 2003.
25. Santra, R. and Greene, C.H., Tensorial analysis of the long-range interaction between metastable alkaline–earth–metal atoms, Phys. Rev. A, 67, 062713, 2003.
26. Maxwell, S.E., Hummon, M.T., Wang, Y., Buchachenko, A.A., Krems, R.V., and Doyle, J.M., Spin-orbit interaction and large inelastic rates in bismuth-helium collisions. Phys. Rev. A, 78, 042706, 2008.
27. Mayer, M.G., Rare-earth and transuarnic elements, Phys. Rev., 60, 184–187, 1941.
28. Hancox, C.I., Doret, S.C., Hummon, M.T., Luo, L., and Doyle, J.M., Magnetic trapping of rare-earth atoms at millikelvin temperatures, Nature, 431, 281–284, 2004.
29. Hancox, C.I., Doret, S.C., Hummon, M.T., Krems, R.V., and Doyle, J.M., Suppression of angular momentum transfer in cold collisions of transition metal atoms in ground states with nonzero orbital angular momentum, Phys. Rev. Lett., 94, 013201, 2005.
30. Campbell, W.C., Tscherbul, T.V., Lu, H.-I., Tsikata, E., Krems, R.V., and Doyle, J.M., Mechanism of collisional spin relaxation in 3Σ molecules. Phys. Rev. Lett., 102, 013003, 2009.
31. Krems, R.V. and Dalgarno, A., Quantum-mechanical theory of atom–molecule and molecular collisions in a magnetic field: Spin depolarization. J. Chem. Phys., 120(5), 2296–2307, 2004.
32. There is a typo in Ref. [4]; the quoted elastic-to-inelastic collision ratio should read σe/σs > 104.
33. Maussang, K., Egorov, D., Helton, J.S., Nguyen, S.V., and Doyle, J.M., Zeeman relaxation of CaF in low-temperature collisions with helium, Phys. Rev. Lett., 94, 123002, 2005.
34. Mizushima, M., The Theory of Rotating Diatomic Molecules, Wiley, NewYork, 1975.
35. Cybulski, H., Krems, R.V., Sadeghpour, H.R., Dalgarno, A., Kłos, J., Groenenboom, G.C., van derAvoird, A., Zgid, D., and Chałasiński, G., Interaction of NH(X3Σ −) with He: Potential energy surface, bound states, and collisional relaxation, J. Chem. Phys., 122, 094307, 2005.
36. Krems, R.V., Sadeghpour, H.R., Dalgarno, A., Zgid, D., Kłos, J., and Chałasiński, G., Low-temperature collisions of NH(X3Σ −) molecules with He atoms in a magnetic field: An ab initio study, Phys. Rev. A, 68, 051401(R), 2003.
37. Maxwell, S.E., Brahms, N., deCarvalho, R., Glenn, D.R., Helton, J.S., Nguyen, S.V., Patterson, D., Petricka, J., DeMille, D., and Doyle, J.M., High-flux beam source for cold, slow atoms or molecules, Phys. Rev. Lett., 95(17), 173201, 2005.
38. Egorov, D., Weinstein, J.D., Patterson, D., Friedrich, B., and Doyle, J.M., Spectroscopy of laser-ablated buffer-gas-cooled PbO at 4K and the prospects for measuring the electric dipole moment of the electron, Phys. Rev. A, 63, 030501(R), 2001.
39. Patterson, D. and Doyle, J.M., Bright, guided molecular beam with hydrodynamic enhancement, J. Chem. Phys., 126, 154307, 2007.
40. Anderson, J.B., Separation of gas mixtures in free jets, AIChE Journal, 13(6), 1188–1192, 1967.
41. Waterman, P.C. and Stern, S.A., Separation of gas mixtures in a supersonic jet, J. Chem. Phys., 31(2), 405–419, 1959.
42. Egorov, D.M., Buffer-gas cooling of diatomic molecules, Ph.D. thesis, Harvard University, 2004.
43. Crownover, R.L., Willey, D.R., Bittner, D.N., and De Lucia, F.C., Very low temperature spectroscopy: The pressure broadening coefficients for CH3F between 4.2 and 1.9 K. J. Chem. Phys., 89, 6147–6156, 1988.
44. Beaky, M.M., Flatin, D.C., Holton, J.J., Goyette, T.M., and De Lucia, F.C., Hydrogen and helium pressure broadening of CH3F between 1K and 600 K, J. Mol. Structure, 352/353, 245, 1995.
45. Stoll, M., Buffer-gas cooling and magnetic trapping of CrH and MnH molecules, Ph.D. thesis, Humboldt-Universität zu Berlin, 2008.
46. Willey, D.R., Crownover, R.L., Bittner, D.N., and De Lucia, F.C., Very low temperature spectroscopy: The pressure broadening coefficients for CO–He between 4.3 and 1.7 k. J. Chem. Phys., 89, 1923, 1988.
47. Beaky, M.M., Goyette, T.M., and De Lucia, F.C., Pressure broadening and line shift measurement of carbon monoxide in collision with helium from 1 to 600 K, J. Chem. Phys., 105, 3994, 1996.
48. Willey, D.R., Choong, V.E., and De Lucia, F.C., Very low temperature helium pressure broadening of DCl in a collisionally cooled cell, J. Chem. Phys., 96, 898–902, 1992.
49. Willey, D.R., Bittner, D.N., and De Lucia, F.C., Pressure broadening cross-sections for the H2S–He system in the temperature region between 4.3 and 1.8 K, J. Molec. Spec., 134, 240, 1989.
50. Ronningen, T.J. and De Lucia, F.C., Helium induced pressure broadening and shifting of HCN hyperfine transitions between 1.3 and 20 K, J. Chem. Phys., 122, 184319, 2005.
51. Campbell, W.C., Magnetic trapping of imidogen molecules, Ph.D. thesis, Harvard University, 2008.
52. See, for example, Euro. Phys. J. D, 2004, Special Issue on Cold Molecules.
53. Patterson, D., Rasmussen, J., and Doyle, J.M., Intense atomic and molecular beams via neon buffer gas cooling, New Journal of Physics, 2009 (to be published).
54. van Buuren, L.D., Sommer, C., Motsch, M., Pohle, S., Schenk, M., Bayerl, J., Pinske, P.W.H., and Rempe, G., Electrostatic extraction of cold molecules from a cryogenic reservoir. Phys. Rev. Lett., 102, 033001, 2009.
55. Willey, D.R., Bittner, D.N., and De Lucia, F.C., Collisional cooling of the NO–He system: The pressure broadening cross-sections between 4.3 and 1.8 K. Mol. Phys., 66, 1, 1988.
56. Ball, C.D. and De Lucia, F.C., Direct observation ofΛ-doublet and hyperfine branching ratios for rotationally inelastic collisions of NO–He at 4.2 K, Chem. Phys. Lett., 300, 227–235, 1999.
57. DeMille, D., et al. Cold beam of SrO for trapping studies. Unpublished.
58. Vutha, A.C., Baker, O.K., Campbell, W.C., DeMille, D., Doyle, J.M., Gabrielse, G., Gurevich, Y.V., and Jansen, M.A.H.M., Cold beam of ThO for EDM studies. Unpublished.
59. Weinstein, J.D., deCarvalho, R., Amar, K., Boca, A., Odom, B.C., Friedrich, B., and Doyle, J.M., Spectroscopy of buffer-gas cooled vanadium monoxide in a magnetic trapping field, J. Chem. Phys., 109(7), 2656–2661, 1998.
60. Brahms, N., Newman, B., Johnson, C., Kleppner, D., Greytak, T., and Doyle, J.M., Magnetic trapping of silver and copper, and anomolous spin–relaxation in the Ag–He system, submitted to PRL.
61. Newman, B., Brahms, N., Johnson, C., Kleppner, D., Greytak, T., and Doyle, J., Buffergas cooled cerium, 2008. Unpublished.
62. Bakker, J.M., Stoll, M., Weise, D.R., Vogelsang, O., Meijer, G., and Peters, A., Magnetic trapping of buffer-gas-cooled chromium atoms and prospects for the extension to paramagnetic molecules, J. Phys. B, 39, S1111, 2006.
63. Parsons, M., Chakraborty, R., Campbell, W., and Doyle, J.M., Ablation studies, Unpublished, 2008.
64. Hancox, C.I., Doret, S.C., Hummon, M.T., Luo, L., and Doyle, J.M., Buffer-gas cooling of gadolinium. Unpublished.
65. Nguyen, S., Doret, S.C., Connolly, C., Michniak, R., Ketterle, W., and Doyle, J.M., Evaporation of metastable helium in the multi-partial-wave regime, Phys. Rev. A, 92, 060703(R), 2005.
66. Nguyen, S.V., Doret, S.C., Helton, J., Maussang, K., and Doyle, J.M., Buffer gas cooled hafnium, 2008. Unpublished.
67. deCarvalho, R., Brahms, N., Newman, B., Doyle, J.M., Kleppner, D., and Greytak, T., A new path to ultracold hydrogen, Can. J. Phys., 83, 293–300, 2005.
68. Nguyen, S.V., Helton, J.S., Maussang, K., Ketterle, W., and Doyle, J.M., Magnetic trapping of an atomic 55Mn–52Cr mixture, Phys. Rev. A, 71, 025602, 2005.
69. Nguyen, S.V., Harris, J.G.E., Doret, S.C., Helton, J., Michniak, R.A., Ketterle, W., and Doyle, J.M., Spin-exchange and dipolar relaxation of magnetically trapped Mn, Phys. Rev. Lett., 99, 2007.
70. Hancox, C.I., Hummon, M.T., Nguyen, S.V., and Doyle, J.M., Magnetic trapping of atomic molybdenum, Phys. Rev. A, 71, 031402, 2004.
71. Hummon, M.T., Campbell, W.C., Lu, H., Tsikata, E., Wang, Y., and Doyle, J.M., Magnetic trapping of atomic nitrogen (14N) and cotrapping of NH (X3Σ −), Phys. Rev. A, 78, 050702(R), 2008.
72. Nguyen, S.V., Michniak, R., and Doyle, J., Trapping of Na in the presence of buffer gas, 2004.
73. Hong, T., Gorshkov, A.V., Patterson, D., Zibrov, A.S., Doyle, J.M., Lukin, M.D., and Prentiss, M.G., Realization of coherent optically dense media via buffer-gas cooling. Phys. Rev. A, 79, 013806, 2009.
74. Hancox, C.I., Magnetic trapping of transition-metal and rare-earth atoms using buffer gas loading, Ph.D. thesis, Harvard University, 2005.
75. Patterson, D. and Doyle, J.M., Buffer gas cooled Yb in cell, 2008. Unpublished.
76. mJ = ±J.
77. We will focus here on the case where the magnetic moment comes entirely from electron spin, although it is possible for the magnetic moment to have contributions from electron orbital angular momentum.
78. A more recent analysis of the data gives this value, which is larger than that quoted in Refs. [4], [18], and [32].