Thermionic emission as a probe of low-energy electron attachment to fullerenes
Thermionic emission as a probe of low-energy electron attachment to fullerenes
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DOI：
10.1103/physreva.90.033415
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发表时间：
2014-09-15
影响因子：
2.9
通讯作者：
Bordas, Christian
中科院分区：
文献类型：
--
作者：
Concina, Bruno;Lepine, Franck;Bordas, Christian
报道了富勒烯阴离子C-n(-)(n=60，70，78，84，90)的延迟统计电子发射。用速度图成像光谱仪测量了纳秒激光激发后延迟约100 ns的动能释放分布。它们随着分子大小的变化而表现出显著的变化。在详细平衡的框架下，他们的分析需要描述反向过程，即电子与中性富勒烯的结合。为此，使用了量子Vogt和Wannier的形式，它允许引入分子内振动重分布(IVR)的经验表达式。关于IVR的信息已经从实验光谱的拟合中推导出来，并利用分子对称性进行了解释。特别是，C-60具有与其二十面体对称性相关的原始行为。
We report on the delayed statistical electron emission of photoexcited fullerene anions C-n(-) (n = 60, 70, 78, 84, 90). Kinetic energy release distributions have been measured by a velocity-map imaging spectrometer for delays of about 100 ns after the nanosecond laser excitation. They show significant variations as a function of the molecular size. Their analysis in the frame of the detailed balance requires the description of the reverse process, namely the electron attachment to the neutral fullerene. For this purpose, the quantum Vogt and Wannier's formalism is used, which allows introducing an empirical expression for the intramolecular vibrational redistribution (IVR). Information on the IVR has been deduced from the fit of the experimental spectra and has been interpreted using the molecular symmetries. In particular C-60 has an original behavior related to its icosahedral symmetry.