Time-resolved measurement of surface diffusion induced by femtosecond laser pulses -: art. no. 236103

被引：60
作者：
Stépán, K
Güdde, J
Höfer, U
机构：
[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[2] Univ Marburg, Zentrum Mat Wissensch, D-35032 Marburg, Germany
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.94.236103
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Diffusion of atomic oxygen on a vicinal Pt(111) surface induced by femtosecond laser pulses has been studied using optical second-harmonic generation as a sensitive in situ probe of the step coverage. Time-resolved studies of the hopping rate for step-terrace diffusion with a two-pulse correlation scheme reveal a time constant of 1.5 ps for the energy transfer from the electronic excitation of the substrate to the frustrated translations of the adsorbate.
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