Desorption of H from Si(111) by resonant excitation of the Si-H vibrational stretch mode

Zhiheng Liu, L. C. Feldman, N. H. Tolk, Zhenyu Zhang, P. I. Cohen

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Abstract

Past efforts to achieve selective bond scission by vibrational excitation have been thwarted by energy thermalization. Here we report resonant photodesorption of hydrogen from a Si(111) surface using tunable infrared radiation. The wavelength dependence of the desorption yield peaks at 0.26 electron volt: the energy of the Si-H vibrational stretch mode. The desorption yield is quadratic in the infrared intensity. A strong H/D isotope effect rules out thermal desorption mechanisms, and electronic effects are not applicable in this low-energy regime. A molecular mechanism accounting for the desorption event remains elusive.

Original languageEnglish
Pages (from-to)1024-1026
Number of pages3
JournalScience
Volume312
Issue number5776
DOIs
Publication statusPublished - May 19 2006

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ASJC Scopus subject areas

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