Desorption of CO from Ru(001) induced by near-infrared femtosecond laser pulses

被引:89
作者
Funk, S [1 ]
Bonn, M [1 ]
Denzler, DN [1 ]
Hess, C [1 ]
Wolf, M [1 ]
Ertl, G [1 ]
机构
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
关键词
D O I
10.1063/1.481626
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Irradiation of a Ru(001) surface covered with CO using intense femtosecond laser pulses (800 nm, 130 fs) leads to desorption of CO with a nonlinear dependence of the yield on the absorbed fluence (100-380 J/m(2)). Two-pulse correlation measurements reveal a response time of 20 ps (FWHM). The lack of an isotope effect together with the strong rise of the phonon temperature (2500 K) and the specific electronic structure of the adsorbate-substrate system strongly indicate that coupling to phonons is dominant. The experimental findings can be well reproduced within a friction-coupled heat bath model. Yet, pronounced dynamical cooling in desorption, found in the fluence-dependence of the translational energy, and in a non-Arrhenius behavior of the desorption probability reflect pronounced deviations from thermal equilibrium during desorption taking place on such a short time scale. (C) 2000 American Institute of Physics. [S0021-9606(00)70122-X].
引用
收藏
页码:9888 / 9897
页数:10
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