The effects of site asymmetry on near-degenerate state-to-state vibronic mixing in flexible bichromophores
Journal Article
·
· Journal of Chemical Physics
- Purdue Univ., West Lafayette, IN (United States); College of William and Mary, Williamsburg, VA (United States)
- Purdue Univ., West Lafayette, IN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Purdue Univ., West Lafayette, IN (United States)
Laser-induced fluorescence excitation and dispersed fluorescence spectra of a model flexible bichromophore, 1,1-diphenylethane (DPE), have been recorded under jet-cooled conditions in the gas phase in the region near the first pair of near-degenerate excited states (S1 and S2). The S1 and S2 origin transitions have been identified at 37 397 and 37 510 cm–1, a splitting of 113 cm–1. This splitting is four times smaller than the excitonic splitting calculated by ab initio methods at the EOM-CCSD/cc-pVDZ level of theory (410 cm–1), which necessarily relies on the Born-Oppenheimer approximation. Dispersed fluorescence spectra provide a state-to-state picture of the vibronic coupling. Furthermore, these results are compared with the results of a multimode vibronic coupling model capable of treating chromophores in asymmetric environments.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- LDRD; USDOE
- Grant/Contract Number:
- 89233218CNA000001; FG02-96ER14656
- OSTI ID:
- 1570631
- Alternate ID(s):
- OSTI ID: 1567931
- Report Number(s):
- LA-UR--19-29710
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 8 Vol. 151; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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