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Volumn 103, Issue 9, 1995, Pages 3561-3577

Coupled-cluster calculations of nuclear magnetic resonance chemical shifts

Author keywords

[No Author keywords available]

Indexed keywords


EID: 36449004178     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.470240     Document Type: Article
Times cited : (254)

References (145)
  • 65
    • 84950525956 scopus 로고
    • Ph.D. thesis, Vrije Universiteit, Amsterdam
    • (1993)
    • Nooijen, M.1
  • 67
    • 84950525954 scopus 로고    scopus 로고
    • the proper definition of the CC expectation value of an operator O is [formula omitted] with T as the cluster operator, [formula omitted] as the CC ket state, and [formula omitted] as the corresponding bra state with Λ as the appropriate deexcitation operator parametrized by the λ amplitudes
    • Following Ref. 41
  • 70
    • 36149014213 scopus 로고
    • The theoretical foundation of the Z-vector method is the more general interchange theorem of double perturbation theory
    • (1953) Phys. Rev. , vol.92 , pp. 1460
    • Sternheimer, R.M.1    Foley, H.M.2
  • 80
    • 85034927009 scopus 로고    scopus 로고
    • This might be questioned, as the formulations given in Refs. 50 and 51 involve steps whose costs scale with the square of the number of perturbations, while in the approach advocated here all the cost of all computationally significant steps does only scale linearly with the number of perturbations submitted
    • J. Chem. Phys.
    • Stanton, J.F.1    Gauss, J.2
  • 131
    • 85034928327 scopus 로고    scopus 로고
    • For the linear molecules, the full shielding tensors can be obtained from knowledge of the isotropic and anisotropic shieldings. The same does not hold for [formula omitted] [formula omitted] and [formula omitted] so that their shielding tensors (as obtained at the GIAO-CCSD level) are given in the following: [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] with the calculation carried out using the following set of Cartesian coordinates (in a.u.): 0, 0, [formula omitted] (oxygen) and 0, [formula omitted] 0.984 293 54 (hydrogens) [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] [formula omitted] with the calculation performed at the following geometry: 0, 0, [formula omitted] (nitrogen), [formula omitted] [formula omitted] [formula omitted] and 0, 1.771 670 23, 0.592 186 98 (hydrogens). The shielding tensor for H is given for the hydrogen in the [formula omitted] plane. [formula omitted] [formula omitted] [formula omitted] [formula omitted] with the calculation carried out with the following coordinates 0, 0, 0 (carbon), 0, [formula omitted] 1.183 772 02, and [formula omitted] 0, [formula omitted] (hydrogens). The [formula omitted] shielding tensor is given for the hydrogen with positive y and z coordinates
    • The hydrogen shielding tensor is given for the hydrogen with negative y coordinate
  • 132
    • 84950526140 scopus 로고    scopus 로고
    • The [formula omitted] basis consists for C, N, O of the [formula omitted] basis described in the text augmented by a single f function with exponents [formula omitted] for C, [formula omitted] for N, and [formula omitted] for O] from Ref. 91. For H, a [formula omitted] contraction (Ref. 90) augmented by two p function (for exponents and one d and f functions have been used. The optimized parameters are [formula omitted] [formula omitted] and [formula omitted] for [formula omitted] [formula omitted] [formula omitted] [formula omitted] and [formula omitted] for [formula omitted] and [formula omitted] and [formula omitted] for [formula omitted])
    • Ref. 92
  • 133


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