Adsorption dependence of vacant-electronic-state densities: As adatom on a lanthanum oxide surface.

Abstract

The electronic structure of the lanthanum oxide surface with an adsorbed As atom has been studied by the X\ensuremath{\alpha} method. Analysis of the occupied electronic density of states and contour maps of the valence-electronic charge density for the bulk and adsorbed surface clusters shows pronounced differences connected with As p-- and La s+La d--state hybridization. The influence of these factors on absorption-spectra features is discussed. The surface reduction effects are considered.