Shedding new light on thermionic electron emission of fullerenes
Shedding new light on thermionic electron emission of fullerenes
复制标题
为富勒烯的热电子发射提供新的线索
DOI：
10.1103/physrevlett.81.1825
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发表时间：
1998
影响因子：
8.6
通讯作者：
G. Meijer
中科院分区：
文献类型：
--
作者：
G. Helden;I. Holleman;A. V. Roij;G. Knippels;A. F. G. Meer;G. Meijer
来自自由电子激光器的可调谐脉冲红外（IR）辐射用于通过富勒烯的振动模式选择性地激发富勒烯到非常高的内能。在吸收了几百个红外光子后，分子可以自动吸收。离子的产生出乎意料地慢，发生在激光激发后超过0.1毫秒的时间，但发现电子预激发分子的速度要快得多。得出结论，达到第一电子激发态是从热分子到离子的一个很高的障碍。
Tunable pulsed infrared (IR) radiation from a free electron laser is used to selectively excite fullerenes via their vibrational modes to very high internal energies. After absorbing several hundred IR photons, the molecules can autoionize. Ion creation is unexpectedly slow, occurring at times beyond 0.1 ms after laser excitation, but is found to be significantly faster for electronically preexcited molecules. It is concluded that reaching the first electronically excited state is a high hurdle on the way from hot molecules to ions.