Ultrafast Relaxation Dynamics Observed Through Time-Resolved Photoelectron Angular Distributions
Ultrafast Relaxation Dynamics Observed Through Time-Resolved Photoelectron Angular Distributions
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DOI：
10.1021/jp1028855
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发表时间：
2010-10-28
影响因子：
2.9
通讯作者：
Verlet, Jan R. R.
中科院分区：
文献类型：
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作者：
Lecointre, Julien;Roberts, Gareth M.;Verlet, Jan R. R.
介绍了7,7,8,8-四氰喹诺二甲烷（TCNQ）自由基阴离子的时间分辨光电子成像。光电子角分布。根据基于对称参数的简单s-p模型定性地分析了（PADs）。从第一激发态(1（2)B(3u)）到基态（B-2(2g)）的内部转换动力学可以通过由基态和激发态的光分离引起的光谱重叠光电子特征的PADs的时间变化来观察。提出了一种从重叠光谱特征的β(2)各向异性参数提取种群动态的公式。该方法用于提取第一激发态的寿命，其结果与时间分辨光电子能谱的观测结果吻合较好。
Time-resolved photoelectron imaging of the 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion is presented. Photoelectron angular distributions.(PADs) are qualitatively analyzed in terms of the simple s-p model that is based on symmetry arguments. The internal conversion dynamics from the first excited state (1(2)B(3u)) to the ground state (B-2(2g)) may be observed through temporal changes in the PADs of the spectrally overlapping photoelectron features arising from photodetachment of the ground state and the excited state. A formulism for extracting the population dynamics from the beta(2) anisotropy parameter of overlapping spectroscopic features is presented. This is used to extract the lifetime of the first excited state, which is in good agreement with that observed in the time-resolved photoelectron spectra.