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Title: Quantifying local exciton, charge resonance, and multiexciton character in correlated wave functions of multichromophoric systems

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4939222· OSTI ID:1468795
ORCiD logo [1];  [2]
  1. Universidad del País Vasco (UPV) Euskal Herriko Unibertsitatea (EHU), Donostia (Spain). Donostia International Physics Center; Basque Foundation for Science, Bilbao (Spain)
  2. Univ. of Southern California, Los Angeles, CA (United States). Dept. of Chemistry

A new method for quantifying the contributions of local excitation, charge resonance, and multiexciton configurations in correlated wave functions of multichromophoric systems is presented. The approach relies on fragment-localized orbitals and employs spin correlators. Its utility is illustrated by calculations on model clusters of hydrogen, ethylene, and tetracene molecules using adiabatic restricted-active-space configuration interaction wave functions. In addition to the wave function analysis, this approach provides a basis for a simple state-specific energy correction accounting for insufficient description of electron correlation. The decomposition scheme also allows one to compute energies of the diabatic states of the local excitonic, charge-resonance, and multi-excitonic character. The new method provides insight into electronic structure of multichromophoric systems and delivers valuable reference data for validating excitonic models.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES); Basque Government
Grant/Contract Number:
FG02-05ER15685
OSTI ID:
1468795
Alternate ID(s):
OSTI ID: 1234175
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 1; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (4)

Spin-flip methods in quantum chemistry journal January 2020
Entanglement entropy of electronic excitations journal May 2016
Short-range density functional correlation within the restricted active space CI method journal March 2018
Singlet fission in spiroconjugated dimers journal May 2019

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