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Cited by 425

The DOI matches its Crossref record; 83 of the 83 references it cites were found in a registry or an index.

A size-consistent state-specific multireference coupled cluster theory: Formal developments and molecular applications

Mahapatra, Uttam Sinha, Datta, Barnali, Mukherjee, Debashis·1999·The Journal of Chemical Physics
DOI 10.1063/1.478523
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Abstract

In this paper we present a comprehensive account of a manifestly size-consistent coupled cluster formalism for a specific state, which is based on a reference function composed of determinants spanning a complete active space (CAS). The method treats all the reference determinants on the same footing and is hence expected to provide uniform description over a wide range of molecular geometry. The combining coefficients are determined by diagonalizing an effective operator in the CAS and are thus completely flexible, not constrained to preassigned values. A separate exponential-type excitation operator is invoked to induce excitations to all the virtual functions from each reference determinant. The linear dependence inherent in this choice of cluster operators is eliminated by invoking suitable sufficiency conditions, which in a transparent manner leads to manifest size extensivity. The use of a CAS also guarantees size consistency. We also discuss the relation of our method with the extant state-specific formalisms. Illustrative applications are presented for systems such as H4 in rectangular and trapezoidal geometries, the Be–H2 C2v insertion reaction path, the potential energy surface of Li2 and F2, and certain states of CH2 and C2 molecules with pronounced multireference character. The results indicate the efficacy of the method for obviating the intruders and of providing accuracy.

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Metadata

Authors
Mahapatra, U. S., Datta, B., & Mukherjee, D.
Venue
The Journal of Chemical Physics
Publisher
AIP Publishing
Published
1999-04-01
Volume
110
Issue
13
Pages
6171-6188
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
DOI
10.1063/1.478523
OpenAlex
W2046622163
Cited by
425
References
83
FWCI
5.39
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: A size-consistent state-specific multireference coupled cluster theory: Formal developments and molecular applications. https://app.cochat.ai/papers/10.1063/1.478523
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Mahapatra, U. S., Datta, B., & Mukherjee, D. (1999). A size-consistent state-specific multireference coupled cluster theory: Formal developments and molecular applications. The Journal of Chemical Physics. https://doi.org/10.1063/1.478523

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.