Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms vol:137 pages:1097-1101
In this work we present preliminary results of a low-energy ion scattering (LEIS) study of a H-induced (1 x 2) reconstruction of the Cu (1 1 0) surface. The surface was bombarded with 6 keV Ar+ ions. Time-of-flight (TOF) azimuthal and polar scans of scattered Ar and recoiled Cu and H were measured at a scattering angle of 45 degrees. To interpret the results obtained, the azimuthal scans were simulated using a new computer program "MATCH" and fitted to the experimental data. The surface was found to be of the (1 x 2) "missing row" reconstruction type. A number of positions for H atoms at the reconstructed surface mentioned were analyzed. The H atoms were observed to be situated in one of two possible trigonal hollow sites as was found before. The desorption and adsorption of H were studied. Desorption from the Cu (1 1 0)-(1 x 2) surface was observed in the temperature range 250-300 K. Above 300 K complete desorption results in de-reconstruction. In the adsorption measurements, the H-saturation took place after an exposure equivalent to 1.4 L at a sample temperature 230 K. (C) 1998 Elsevier Science B.V.