Signatures of vibronic coupling in two-dimensional electronic-vibrational and vibrational-electronic spectroscopies
Journal Article
·
· Journal of Chemical Physics
- Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry; Department of Chemistry, University of Washington, Seattle, Washington (United States)
- Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry
Two-Dimensional Electronic-Vibrational (2D EV) spectroscopy and Two-Dimensional Vibrational-Electronic (2D VE) spectroscopy are new coherent four-wave mixing spectroscopies that utilize both electronically resonant and vibrationally resonant field-matter interactions to elucidate couplings between electronic and vibrational degrees of freedom. Here, a system Hamiltonian is developed to lay a foundation for interpreting the 2D EV and 2D VE signals that arise from a vibronically coupled molecular system in the condensed phase. A molecular system consisting of one anharmonic vibration and two electronic states is modeled. Equilibrium displacement of the vibrational coordinate and vibrational frequency shifts upon excitation to the first electronic excited state are included in our Hamiltonian through linear and quadratic vibronic coupling terms. We explicitly consider the nuclear dependence of the electronic transition dipole moment and demonstrate that these spectroscopies are sensitive to non-Condon effects. A series of simulations of 2D EV and 2D VE spectra obtained by varying parameters of the system, system-bath, and interaction Hamiltonians demonstrate that one of the following conditions must be met to observe signals: (1) non-zero linear and/or quadratic vibronic coupling in the electronic excited state, (2) vibrational-coordinate dependence of the electronic transition dipole moment, or (3) electronic-state-dependent vibrational dephasing dynamics. We explore how these vibronic interactions are manifested in the positions, amplitudes, and line shapes of the peaks in 2D EV and 2D VE spectroscopies.
- Research Organization:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Camille and Henry Dreyfus Foundation
- Grant/Contract Number:
- SC0012450
- OSTI ID:
- 1474041
- Alternate ID(s):
- OSTI ID: 1378125
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 9 Vol. 147; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Multimode two-dimensional vibronic spectroscopy. II. Simulating and extracting vibronic coupling parameters from polarization-selective spectra
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Tue May 11 00:00:00 EDT 2021
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·
OSTI ID:1853004
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74 ATOMIC AND MOLECULAR PHYSICS
adiabatic theorem
electron spectroscopy
four wave mixing spectroscopy
light harvesting complexes
multidimensional spectroscopy
nanomaterials
quantum chemical dynamics
selection rule
transition moment
vibrational spectra