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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Excited states in electron-transfer reaction products: Ultrafast relaxation dynamics of an isolated acceptor radical anion
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Excited states in electron-transfer reaction products: Ultrafast relaxation dynamics of an isolated acceptor radical anion

机译：电子转移反应产物中的激发态：分离的受体自由基阴离子的超快弛豫动力学

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摘要

The spectroscopy and ultrafast relaxation dynamics of excited states of the radical anion of a representative charge-transfer acceptor molecule, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, have been studied in the gas phase using time-resolved photoelectron spectroscopy. The photoelectron spectra reveal that at least two anion excited states are bound. Time-resolved studies show that both excited states are very short-lived and internally convert to the anion ground state, with the lower energy state relaxing within 200 fs and a near-threshold valence-excited state relaxing on a 60 fs time scale. These excited states, and in particular the valence-excited state, present efficient pathways for electron-transfer reactions in the highly exergonic inverted region which commonly displays rates exceeding predictions from electron-transfer theory.
机译：用气相色谱法研究了代表性的电荷转移受体分子2,3,5,6-四氟-7,7,8,8-四氰基喹二甲烷的自由基阴离子的激发态的光谱和超快弛豫动力学时间分辨光电子能谱。光电子能谱显示至少两个阴离子激发态被结合。时间分辨研究表明，两种激发态都非常短命，并且在内部转化为阴离子基态，低能态在200 fs内弛豫，接近阈值的价态在60 fs的时间内弛豫。这些激发态，特别是价态激发态，为高能反向区域的电子转移反应提供了有效的途径，通常显示出超过电子转移理论预测的速率。

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