Temperature dependence of photoelectron scattering from a monolayer

Abstract

Monolayers of lead on Ge(111) were investigated using angle-resolved photoelectron spectroscopy with synchrotron radiation. A narrow state close to the valence-band maximum is found to have the characteristics of a lead-induced surface resonance. This surface resonance exhibits a strong intensity dependence on substrate temperature. The temperature dependence is found to be consistent with a Debye-Waller-factor model that incorporates atomic correlations only between overlayer atoms, and neglects multiple scattering. The effective surface Debye temperature is reduced from that of a Pb(111) surface.