Is back-electron transfer process in Betaine-30 coherent?
作者： Shahnawaz Rafiq , Gregory D. Scholes
DOI: 10.1016/J.CPLETT.2017.03.020
关键词: Chemistry 、 Coherence (physics) 、 Dephasing 、 Ultrashort pulse 、 Band gap 、 Time constant 、 Atomic physics 、 Spectroscopy 、 Quantum 、 Optics 、 Electron transfer
摘要: Abstract The possible role of coherent vibrational motion in ultrafast photo-induced electron transfer remains unclear despite considerable experimental and theoretical advances. We revisited this problem by tracking the back-electron (bET) process Betaine-30 with broadband pump-probe spectroscopy. Dephasing time constant certain high-frequency vibrations as a function solvent shows trend similar to ET rates. In purview Bixon-Jortner model, quantum bridge reactant-product energy gap providing activationless vibronic channels. Such interaction reduces effective coupling significantly thereby coherence effects are eliminated due fluctuations, making incoherent.
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