Ultrafast laser excitation of CO/Pt(111) probed by sum frequency generation: Coverage dependent desorption efficiency

被引：24

作者：

Fournier, F ^{[1
]}

Zheng, W ^{[1
]}

Carrez, S ^{[1
]}

Dubost, H ^{[1
]}

Bourguignon, B ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, Photophys Mol Lab, F-91405 Orsay, France

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.92.216102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

CO photodesorption from Pt(111) induced by femtosecond laser pulses is probed by IR+visible sum frequency generation (SFG). Steady state analysis of SFG spectra at varying CO pressure and laser fluence allows one to measure a approximate to5 orders of magnitude decrease of the photodesorption rate constant when CO coverage decreases from 0.37 to 0.07 monolayer. We ascribe this effect in the framework of the Menzel-Gomer-Redhead mechanism to electron delocalization in the CO layer. The lifetime of electronic excitation decreases when coverage decreases.

引用

页码：216102 / 1

页数：4

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