Inspired by our earlier semi-stochastic work aimed at converging high-level coupled-cluster (CC) energetics [J. E. Deustua, J. Shen, and P. Piecuch, Phys. Rev. Lett. 119, 223003 (2017) and J. E. Deustua, J. Shen, and P. Piecuch, J. Chem. Phys. 154, 124103 (2021)], we propose a novel form of the CC(P; Q) theory in which the stochastic Quantum Monte Carlo propagations, used to identify dominant higher-than-doubly excited determinants, are replaced by the selected configuration interaction (CI) approach using the perturbative selection made iteratively (CIPSI) algorithm. The advantages of the resulting CIPSI-driven CC(P; Q) methodology are illustrated by a few molecular examples, including the dissociation of F2 and the automerization of cyclobutadiene, where we recover the electronic energies corresponding to the CC calculations with a full treatment of singles, doubles, and triples based on the information extracted from compact CI wave functions originating from relatively inexpensive Hamiltonian diagonalizations.
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7 November 2021
Research Article|
November 03 2021
High-level coupled-cluster energetics by merging moment expansions with selected configuration interaction Available to Purchase
Karthik Gururangan
;
Karthik Gururangan
1
Department of Chemistry, Michigan State University
, East Lansing, Michigan 48824, USA
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J. Emiliano Deustua
;
J. Emiliano Deustua
a)
1
Department of Chemistry, Michigan State University
, East Lansing, Michigan 48824, USA
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Jun Shen
;
Jun Shen
1
Department of Chemistry, Michigan State University
, East Lansing, Michigan 48824, USA
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Piotr Piecuch
Piotr Piecuch
b)
1
Department of Chemistry, Michigan State University
, East Lansing, Michigan 48824, USA
2
Department of Physics and Astronomy, Michigan State University
, East Lansing, Michigan 48824, USA
b)Author to whom correspondence should be addressed: [email protected]
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Karthik Gururangan
1
J. Emiliano Deustua
1,a)
Jun Shen
1
Piotr Piecuch
1,2,b)
1
Department of Chemistry, Michigan State University
, East Lansing, Michigan 48824, USA
2
Department of Physics and Astronomy, Michigan State University
, East Lansing, Michigan 48824, USA
a)
Present address: Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
b)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 155, 174114 (2021)
Article history
Received:
July 22 2021
Accepted:
October 11 2021
Citation
Karthik Gururangan, J. Emiliano Deustua, Jun Shen, Piotr Piecuch; High-level coupled-cluster energetics by merging moment expansions with selected configuration interaction. J. Chem. Phys. 7 November 2021; 155 (17): 174114. https://doi.org/10.1063/5.0064400
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