Employing an intermediate state representation (ISR) approach, Hermitian second-order methods for the calculation of electronic excitation energies are presented and compared in detail. These comprise the algebraic–diagrammatic construction scheme for the polarization propagator, a hybrid second-order ISR scheme based on traditional coupled-cluster theory as well as two similar approaches based on a unitary coupled-cluster (UCC) ansatz. Although in a strict perturbation-theoretical framework all prove to be identical, differences emerge when the corresponding converged cluster amplitudes are used and depending on how the similarity-transformed UCC Hamiltonian is evaluated. The resulting excitation energies, however, do not significantly differ for systems well described by means of perturbation theory.
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7 March 2020
Research Article|
March 02 2020
Hermitian second-order methods for excited electronic states: Unitary coupled cluster in comparison with algebraic–diagrammatic construction schemes
Manuel Hodecker
;
Manuel Hodecker
a)
Interdisciplinary Center for Scientific Computing, Heidelberg University
, Im Neuenheimer Feld 205, D–69120 Heidelberg, Germany
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Dirk R. Rehn
;
Dirk R. Rehn
Interdisciplinary Center for Scientific Computing, Heidelberg University
, Im Neuenheimer Feld 205, D–69120 Heidelberg, Germany
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Andreas Dreuw
Andreas Dreuw
b)
Interdisciplinary Center for Scientific Computing, Heidelberg University
, Im Neuenheimer Feld 205, D–69120 Heidelberg, Germany
b)Author to whom correspondence should be addressed: [email protected]
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a)
Electronic mail: [email protected]
b)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 152, 094106 (2020)
Article history
Received:
December 12 2019
Accepted:
February 09 2020
Citation
Manuel Hodecker, Dirk R. Rehn, Andreas Dreuw; Hermitian second-order methods for excited electronic states: Unitary coupled cluster in comparison with algebraic–diagrammatic construction schemes. J. Chem. Phys. 7 March 2020; 152 (9): 094106. https://doi.org/10.1063/1.5142354
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