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Desorption of H from Si(111) by Resonant Excitation of the Si-H Vibrational Stretch Mode

Science  19 May 2006:
Vol. 312, Issue 5776, pp. 1024-1026
DOI: 10.1126/science.1124529

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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.

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