An x-ray standing-wave study of adsorption on InP(110)

The sulphur adsorption site for -dosed InP(110) has been determined using normal-incidence x-ray standing waves (NIXSW) using the (220), (022) and (113) Bragg planes for triangulation. Photoabsorption was monitored by photoelectron emission from the S 1s, P 1s and In core levels. The sulphur was found to be located in the phosphorus sites of the continued-layer structure, bonding to the surface indium. Using Auger electron emission for surface-sensitive NIXSW, it was found that adsorption lifts the relaxation of the clean surface.