Ultrafast electron dynamics at metal surfaces: Competition between electron-phonon coupling and hot-electron transport
Ultrafast electron dynamics at metal surfaces: Competition between electron-phonon coupling and hot-electron transport
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DOI：
10.1103/physrevb.61.1101
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发表时间：
2000-01-01
影响因子：
3.7
通讯作者：
Hohlfeld, J
中科院分区：
文献类型：
--
作者：
Bonn, M;Denzler, DN;Hohlfeld, J
一种实验方案（利用飞秒激光脉冲的双泵浦/反射率探针）可以通过测量平衡表面温度来研究金属表面的非平衡电子动力学。电子-声子耦合和热电子输运之间的竞争导致两个泵浦脉冲在时间上重叠时平衡温度降低，并提供了一种精确确定电子-声子耦合常数的方法。这些观测结果对飞秒光化学研究具有重要意义。
An experimental scheme (double pump/reflectivity probe using femtosecond laser pulses) enables the investigation of nonequilibrium electron dynamics at metal surfaces by measuring the equilibrated surface temperature. The competition between electron-phonon coupling and hot-electron transport gives rise to a reduced equilibrated temperature when the two pump pulses overlap in time, and provides a way of accurately determining the electron-phonon coupling constant. These observations have important consequences for femtosecond photochemical investigations.