AN ARUPS NEXAFS STUDY OF THE H2S/INP(110) ADSORBATE SYSTEM/

The room temperature adsorption of H2S on InP(110) may be understood a s a cooperative dissociation in which H+ and SH- bond to the surface a nion and cation, respectively. Synchrotron radiation angle resolved ul traviolet photoelectron spectroscopy (ARUPS) and near edge X-ray absor ption fine structure (NEXAFS) are used to probe the filled and vacant orbital levels of the adsorbate complex. The NEXAFS results are consis tent with the location of the sulphur in the continued layer anion sit e in agreement with recent X-ray standing wave measurements.