메뉴 건너뛰기




Volumn 121, Issue 16, 2004, Pages 7624-7631

Triplet instability in doublet systems

Author keywords

[No Author keywords available]

Indexed keywords

COUPLED CLUSTERS (CC); RESTRICTED KOHN-SHAM (RKS) FORMALISM; UNRESTRICTED KOHN-SHAM (RKS) FORMALISM; WAVE FUNCTIONS;

EID: 8344254470     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1795153     Document Type: Review
Times cited : (38)

References (41)
  • 1
    • 0000533004 scopus 로고
    • and references therein
    • R. J. Bartlett, J. Phys. Chem. 93, 1697 (1989), and references therein.
    • (1989) J. Phys. Chem. , vol.93 , pp. 1697
    • Bartlett, R.J.1
  • 2
    • 0000111526 scopus 로고    scopus 로고
    • edited by P. v. R. Schleyer, N. L. Allinger, T. Clark, J. Gasteiger, P. Kollmann, H. F. Schaefer, and P. R. Schreiner (Wiley, Chichester)
    • J. Gauss, in Encyclopedia of Computational Chemistry, edited by P. v. R. Schleyer, N. L. Allinger, T. Clark, J. Gasteiger, P. Kollmann, H. F. Schaefer, and P. R. Schreiner (Wiley, Chichester, 1998), p. 615.
    • (1998) Encyclopedia of Computational Chemistry , pp. 615
    • Gauss, J.1
  • 3
    • 0001039562 scopus 로고
    • edited by R. Yarkony (World Scientific, Singapore)
    • R. J. Bartlett, in Modern Electronic Structure Theory, edited by R. Yarkony (World Scientific, Singapore, 1995), Vol. 2, p. 1047.
    • (1995) Modern Electronic Structure Theory , vol.2 , pp. 1047
    • Bartlett, R.J.1
  • 6
    • 8344273439 scopus 로고    scopus 로고
    • note
    • Quote attributed for T. H. Dunning.
  • 13
    • 8344288082 scopus 로고    scopus 로고
    • note
    • Excluded here are cases in which closed-shell systems (usually singlet biradicals) are treated with a spin-polarized UHF reference function.
  • 25
    • 8344221835 scopus 로고    scopus 로고
    • note
    • In multidimensional systems, the geometrical interpretation of what is meant by "beyond" is of course nontrivial. However, thinking of this in terms of a diatomics (or an isolated bond stretching coordinate) is sufficient here.
  • 27
    • 8344275013 scopus 로고    scopus 로고
    • note
    • When there is no triplet instability present, the UHF and RHF orbitals are the same. Then the occupied orbitals have UNO occupation numbers of two and the unoccupied orbitals have occupation number zero.
  • 30
    • 8344269267 scopus 로고    scopus 로고
    • note
    • e to have a negligible impact on calculated properties (see Sec. III).
  • 31
    • 0001136801 scopus 로고
    • edited by K. N. Rao and C. W. Mathews (Academic, New York)
    • I. M. Mills, in Molecular Spectroscopy: Modern Research, edited by K. N. Rao and C. W. Mathews (Academic, New York, 1972), p. 115.
    • (1972) Molecular Spectroscopy: Modern Research , pp. 115
    • Mills, I.M.1
  • 37
    • 8344227541 scopus 로고    scopus 로고
    • note
    • 2=7/9].
  • 39
    • 8344279466 scopus 로고    scopus 로고
    • note
    • The word "almost" is used here, because the eigenvalue never reaches zero. In a case where there is a symmetry-breaking instability, the eigenvalue indeed reaches zero, and all derivatives of the energy will diverge at such a point for any calculation other than full CI. For PO, and any other case in which the two "competing" solutions mix at all distances, this will not occur and there is a limit on how poor the results can become.
  • 40
    • 35848953179 scopus 로고    scopus 로고
    • edited by M. Chase, Jr. (NIST, Washington, DC.)
    • NIST-JANAF Thermochemical Tables., edited by M. Chase, Jr. (NIST, Washington, DC., 1998).
    • (1998) NIST-JANAF Thermochemical Tables


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.