A quantum theory of thermal desorption of light noble gases, at low temperatures, in the framework of the distorted-wave Born approximation, is presented. Such a theory has been applied to the calculation of the angle-resolved thermal desorption flux, and time-of-flight spectrum for Ne-Cu(111) using a microscopic description of the phonons of Cu(111), and a realistic gas-solid potential. We show that desorption is driven by long-wavelength phonons, but the precise angular dependence results from the temperature-dependent interplay of statistical and dynamical factors. The angular distribution is narrower than cosine at 4 K, broader than cosine at 12 K, and distinctly non-cosine for temperatures greater than 20 K with the maximum away from the surface normal. He desorbing from graphite shows similar features.

Theory of Thermal Desorption of Light Noble Gases from Metals: Aplication to Ne-Cu(111) / Gp, Brivio; Tb, Grimley; Bortolani, Virginio; Santoro, Giorgio. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 245:(1991), pp. 17-28.

Theory of Thermal Desorption of Light Noble Gases from Metals: Aplication to Ne-Cu(111)

BORTOLANI, Virginio;SANTORO, Giorgio
1991

Abstract

A quantum theory of thermal desorption of light noble gases, at low temperatures, in the framework of the distorted-wave Born approximation, is presented. Such a theory has been applied to the calculation of the angle-resolved thermal desorption flux, and time-of-flight spectrum for Ne-Cu(111) using a microscopic description of the phonons of Cu(111), and a realistic gas-solid potential. We show that desorption is driven by long-wavelength phonons, but the precise angular dependence results from the temperature-dependent interplay of statistical and dynamical factors. The angular distribution is narrower than cosine at 4 K, broader than cosine at 12 K, and distinctly non-cosine for temperatures greater than 20 K with the maximum away from the surface normal. He desorbing from graphite shows similar features.
245
17
28
Theory of Thermal Desorption of Light Noble Gases from Metals: Aplication to Ne-Cu(111) / Gp, Brivio; Tb, Grimley; Bortolani, Virginio; Santoro, Giorgio. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 245:(1991), pp. 17-28.
Gp, Brivio; Tb, Grimley; Bortolani, Virginio; Santoro, Giorgio
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/305312
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