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Title: A low-cost approach to electronic excitation energies based on the driven similarity renormalization group

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.4997480 · OSTI ID:1474047
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2]
  1. Emory Univ., Atlanta, GA (United States). Dept. of Chemistry and Cherry Emerson Center for Scientific Computation; Department of Chemistry and Cherry Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia (United States)
  2. Emory Univ., Atlanta, GA (United States). Dept. of Chemistry and Cherry Emerson Center for Scientific Computation

Here, we propose an economical state-specific approach to evaluate electronic excitation energies based on the driven similarity renormalization group truncated to second order (DSRG-PT2). Starting from a closed-shell Hartree–Fock wave function, a model space is constructed that includes all single or single and double excitations within a given set of active orbitals. The resulting VCIS-DSRG-PT2 and VCISD-DSRG-PT2 methods are introduced and benchmarked on a set of 28 organic molecules [M. Schreiber et al., J. Chem. Phys. 128, 134110 (2008)]. Taking CC3 results as reference values, mean absolute deviations of 0.32 and 0.22 eV are observed for VCIS-DSRG-PT2 and VCISD-DSRG-PT2 excitation energies, respectively. Overall, VCIS-DSRG-PT2 yields results with accuracy comparable to those from time-dependent density functional theory using the B3LYP functional, while VCISD-DSRG-PT2 gives excitation energies comparable to those from equation-of-motion coupled cluster with singles and doubles.

Research Organization:
Emory Univ., Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Alfred P. Sloan Foundation
Grant/Contract Number:
SC0016004
OSTI ID:
1474047
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 7 Vol. 147; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Benchmarks for Electronically Excited States with CASSCF Methods journal May 2019
Driven similarity renormalization group for excited states: A state-averaged perturbation theory journal March 2018
Perspective: Multireference coupled cluster theories of dynamical electron correlation journal July 2018
Communication: A mean field platform for excited state quantum chemistry journal August 2018
A simplified account of the correlation effects to bond breaking processes: The Brillouin-Wigner perturbation theory using a multireference formulation journal August 2019
Analytic gradients for the single-reference driven similarity renormalization group second-order perturbation theory journal July 2019