Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 151, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5115154
Keywords
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Funding
- European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie Grant [713683]
- DTU Chemistry
- Independent Research Fund Denmark [4002-00272, 014-00258B, 8021-00347B]
- U.S. National Science Foundation [CHE-1856342]
- Simons Foundation
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As a demonstration of the analysis of the electronic structure and the nuclear dynamics from time-resolved near-edge X-ray absorption fine structure (TR-NEXAFS), we present the TR-NEXAFS spectra of pyrazine following the excitation to the B-1(2u)(pi pi*) state. The spectra are calculated combining the frozen-core/core-valence separated equation-of-motion coupled cluster singles and doubles approach for the spectral signatures and the multiconfiguration time-dependent Hartree method for the wave packet propagation. The population decay from the B-1(2u)(pi pi*) state to the B-1(3u)(n pi*) and (1)A(u)(n pi*) states, followed by oscillatory flow of population between the B-1(3u)(n pi*) and (1)A(u)(n pi*) states, is interpreted by means of visualization of the potential energy curves and the reduced nuclear densities. By examining the electronic structure of the three valence-excited states and the final core-excited states, we observe that the population dynamics is explicitly reflected in the TR-NEXAFS spectra, especially when the heteroatoms are selected as the X-ray absorption sites. This work illustrates the feasibility of extracting fine details of molecular photophysical processes from TR-NEXAFS spectra by using currently available theoretical methods.
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