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Volumn 109, Issue 2, 1998, Pages 373-384

Quantum cluster equilibrium theory of liquids: Illustrative application to water

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Indexed keywords


EID: 0346257938     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.476574     Document Type: Article
Times cited : (100)

References (54)
  • 4
    • 84873055189 scopus 로고
    • For an authoritative description of the standard notation for quantum chemical methods and basis sets, see Wiley, New York
    • For an authoritative description of the standard notation for quantum chemical methods and basis sets, see W. J. Hehre, L. Radom, P. v. R. Schleyer, and J. A. Pople, Ab Initio Molecular Orbital Theory (Wiley, New York, 1986).
    • (1986) Ab Initio Molecular Orbital Theory
    • Hehre, W.J.1    Radom, L.2    Schleyer, P.V.R.3    Pople, J.A.4
  • 7
    • 22244490723 scopus 로고
    • (a) Among recent theoretical studies:
    • (a) Among recent theoretical studies: E. P. F. Lee and J. M. Dyke, Mol. Phys. 73, 3755 (1991);
    • (1991) Mol. Phys. , vol.73 , pp. 3755
    • Lee, E.P.F.1    Dyke, J.M.2
  • 16
    • 0000756317 scopus 로고
    • (b) Experimental studies:
    • (b) Experimental studies: T. R. Dyke, J. Chem. Phys. 66, 492 (1977);
    • (1977) J. Chem. Phys. , vol.66 , pp. 492
    • Dyke, T.R.1
  • 23
    • 22244453808 scopus 로고    scopus 로고
    • Ref. 4, p. 229ff
    • Ref. 4, p. 229ff.
  • 24
    • 0004107550 scopus 로고
    • Prentice-Hall, Englewood Cliffs, NJ
    • I. Levine, Quantum Chemistry (Prentice-Hall, Englewood Cliffs, NJ, 1991), p. 603;
    • (1991) Quantum Chemistry , pp. 603
    • Levine, I.1
  • 37
    • 22244461586 scopus 로고    scopus 로고
    • The role of such clusters in the solid-liquid transition region are discussed in a forthcoming paper; (unpublished)
    • The role of such clusters in the solid-liquid transition region are discussed in a forthcoming paper; R. Ludwig and F. Weinhold (unpublished).
    • Ludwig, R.1    Weinhold, F.2
  • 38
    • 22244476461 scopus 로고    scopus 로고
    • note
    • For this reason, little numerical effect is seen when the w8c cluster is omitted from higher correlated treatments (MP2, B3LYP), where it is found not to be a distinct equilibrium species.
  • 41
    • 22244451748 scopus 로고    scopus 로고
    • note
    • (0) thermodynamic predictions.
  • 42
    • 22244483829 scopus 로고    scopus 로고
    • note
    • However, the relative insensitivity of QCE thermodynamics to H-bond torsions would be altered by perturbations that are sensitive to this property. For example, the high-symmetry cyclic hexamer w6c [Fig. 1(e)] has no dipole moment and could thus differ significantly from other rotamers with respect to electric field effects.
  • 43
    • 22244487066 scopus 로고    scopus 로고
    • note
    • As mentioned in the previous paper (footnote 1 of Ref. 2), empirical potential parameters are usually considered to include some "average" contribution from higher cooperative effects. The chosen "effective" bond energy may therefore not match the actual dimer bond energy. However, qualitatively similar (unphysical) behavior is found for many other possible bond energy values.
  • 44
    • 22244443115 scopus 로고    scopus 로고
    • note
    • The few very modes that would have been shifted to negative frequencies by the softening procedure were set to +1 K.
  • 47
    • 22244457114 scopus 로고    scopus 로고
    • note
    • (0) model (with molar volume 10.7 mL) is composed of 0.3% monomer and 99.7% large cyclic clusters, whereas in the high-density phase of Fig. 8 the corresponding values are 0.7% and 99.3% (but with higher proportion of w8c to w5c,w6c in the latter case). The compositions of the gas phases in the two models are practically identical: w (98.1%), w5c (1.6%), w2 (0.2%), w6c (0.1%).
  • 48
    • 22244477803 scopus 로고    scopus 로고
    • note
    • xv=1.32 model (with molar volume 18.3 mL) has composition w8c (87.5%), w5c (8.8%), w6c (3.1%), w (0.7%).
  • 51
    • 22244490427 scopus 로고    scopus 로고
    • note
    • Since the pressure dependence is so weak, the "infinitesimal" ΔP can be chosen rather arbitrarily in the range 5-50 atm with no appreciable loss of numerical accuracy (the plotted values were computed with ΔP=19atm).
  • 52
    • 22244467794 scopus 로고    scopus 로고
    • note
    • vap=41.6kJ/mol. The surprisingly high accuracy of the simple RHF/3-21G treatment is presumably due to partial cancellation of errors due to neglect of electron correlation and incomplete CP-suppression of BSSE.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.