Abstract
The Brueckner doubles variant of coupled cluster theory has recently been reintroduced by the authors. The use of Brueckner orbitals means that the governing equations for T̂2 take a particularly simple form. Here we give the details for the evaluation of the gradient of the Brueckner doubles energy for (a) the unrestricted spin–orbital formalism and (b) the closed-shell restricted formalism. Applications are presented for H2O, NH3, CH4, H2CO, C2H2, HCN, and CO2 and comparisons are made with the Hartree–Fock, second order Mo/ller–Plesset and quadratic configuration interaction models and with experiment.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 8:46 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 10, 2024, 8:47 a.m.) |
Indexed | 4 months, 1 week ago (April 22, 2025, 6:25 a.m.) |
Issued | 33 years, 10 months ago (Nov. 1, 1991) |
Published | 33 years, 10 months ago (Nov. 1, 1991) |
Published Print | 33 years, 10 months ago (Nov. 1, 1991) |
@article{Kobayashi_1991, title={Gradient theory applied to the Brueckner doubles method}, volume={95}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.461544}, DOI={10.1063/1.461544}, number={9}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Kobayashi, Rika and Handy, Nicholas C. and Amos, Roger D. and Trucks, Gary W. and Frisch, Michael J. and Pople, John A.}, year={1991}, month=nov, pages={6723–6733} }