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Photophysics of uracil: an explicit time-dependent generating function-based method combining both nonadiabatic and spin-orbit coupling effects

Permanent lenke
https://hdl.handle.net/10037/33206
DOI
https://doi.org/10.1039/d2cp05955j
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Åpne
uracil_peprint_manuscript.pdf (5.302Mb)
Akseptert manusversjon (PDF)
Dato
2023-02-14
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Karak, Pijush; Moitra, Torsha; Ruud, Kenneth; Chakrabarti, Swapan
Sammendrag
We present a composite framework for calculating the rates of non-radiative deactivation processes, namely internal conversion (IC) and intersystem crossing (ISC), on an equal footing by explicitly computing the non-adiabatic coupling (NAC) and spin–orbit coupling (SOC) constants, respectively. The stationary-state approach uses a time-dependent generating function based on Fermi's golden rule. We validate the applicability of the framework by computing the rate of IC for azulene, obtaining comparable rates to experimental and previous theoretical results. Next, we investigate the photophysics associated with the complex photodynamics of the uracil molecule. Interestingly, our simulated rates corroborate experimental observations. Detailed analyses using Duschinsky rotation matrices, displacement vectors and NAC matrix elements are presented to interpret the findings alongside testing the suitability of the approach for such molecular systems. The suitability of the Fermi's golden rule based method is explained qualitatively in terms of single-mode potential energy surfaces.
Forlag
Royal Society of Chemistry
Sitering
Karak, Moitra, Ruud, Chakrabarti. Photophysics of uracil: an explicit time-dependent generating function-based method combining both nonadiabatic and spin-orbit coupling effects. Physical Chemistry, Chemical Physics - PCCP. 2023;25(11):8209-8219
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