Nonadiabatic coupling between C-O stretching and Pt substrate electrons enhanced by frustrated mode excitations
Nonadiabatic coupling between C-O stretching and Pt substrate electrons enhanced by frustrated mode excitations
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DOI：
10.1103/physrevb.81.241408
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发表时间：
2010-06
影响因子：
3.7
通讯作者：
Kazuya Watanabe;Ken‐ichi Inoue;I. Nakai;Y. Matsumoto
中科院分区：
文献类型：
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作者：
Kazuya Watanabe;Ken‐ichi Inoue;I. Nakai;Y. Matsumoto
我们报道了飞秒激光激发的吸附内伸缩振动与衬底电子之间的耦合的瞬时增强。用150 ps的泵浦脉冲在400 nm处对覆盖有一氧化碳(CO)的铂(111)表面进行了辐照。利用带相敏探测的飞秒时间分辨红外可见和频技术，研究了C-O伸缩区非线性极化率虚部的瞬时变化。由于电子-空穴对激发的Fano干涉，C-O伸缩的线形表现出明显的不对称性。CO-铂受挫模式的激发对非绝热耦合的增强起着关键作用。
We report the transient enhancement of coupling between adsorbate internal stretching vibration and substrate electrons induced by femtosecond laser excitation. A Pt(111) surface covered with carbon monoxide (CO) is irradiated with a 150 fs pump pulse at 400 nm. Transient changes in the imaginary part of nonlinear susceptibility in the C-O stretching region are probed by using femtosecond time-resolved infrared-visible sum-frequency generation with phase-sensitive detection. The line shape of C-O stretching shows remarkable asymmetry due to Fano interference with a continuum of electron-hole pair excitation. Excitations of CO-Pt frustrated modes play a key role in the enhancement of the nonadiabatic coupling.