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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

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; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0016004
OSTI ID:
1474047
Alternate ID(s):
OSTI ID: 1375254; OSTI ID: 1925214
Journal Information:
Journal of Chemical Physics, Vol. 147, Issue 7; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (6)

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
Benchmarks for Electronically Excited States with CASSCF Methods journal May 2019