Reconstruction of an InP(001) surface structure upon H2S adsorption was studied by low-energy electron diffraction, scanning tunnelling microscopy, high-resolution electron energy loss, and X-ray photo-electron spectroscopies. The high-resolution electron energy loss spectroscopy results indicated that H2S was dissociated on the surface even at room temperature, leading to evolution of hydrogen from the surface. low-energy electron diffraction patterns show (2 x 4) and (2 x 1) structures for the surface with sulfur coverages, 0 and 0.5 to 1ML, respectively. A complex pattern appeared at 0.25ML. Scanning tunnelling microscopic images showed that the (2 x 1) structure began to form even at 0.1ML sulfur coverage at 350C. The (2 x 1) structure was almost established at 0.5ML although the protrusions of about two atoms in size exist on the surface. The new (2 x 1) structure begins to grow from protrusions above 0.5ML on the (2 x 1) surface found at 0.5ML and it was established at about 1ML where the c(2 x 2) structure with small domain was found. X-ray photo-electron spectroscopy results showed one chemical state of sulfur at 0.55ML with the binding energy at 161.8eV. Above 0.55ML, sulphur 2p spectra contained two components with the binding energy binding energy at 161.8 and 162.2eV. Based upon the angle dependence of the spectrum and the result of the scanning tunnelling microscopic images, these could be attributed to sulfur on and under the surface, respectively. Sulfur was found not to be bonded to phosphorus atoms at 350C.

Surface Reconstruction of InP(001) upon Adsorption of H2S Studied by Low-Energy Electron Diffraction, Scanning Tunnelling Microscopy, High-Resolution Electron Energy Loss, and X-Ray Photoelectron Spectroscopies. M.Shimomura, N.Sanada, S.Ichikawa, Y.Fukuda, M.Nagoshi, P.J.Møller: Journal of Applied Physics, 1998, 83[6], 3071