He diffraction and resonant scattering studies of Rh(110)(1×1)−2H

Abstract

He diffraction measurements and intensity analyses based on the hard-corrugated-wall model are presented for the 1×1 saturation phase of hydrogen on Rh(110). The corrugation function shows that there are two adatoms per unit cell and yields, in connection with surface-charge-density calculations, the hydrogen locations relative to the close-packed Rh rows in good agreement with previous LEED results. Deep troughs in the surface corrugation observed despite the rather uniform geometrical distribution of adatoms point to pronounced pairwise bonding of H atom rows to underlying close-packed Rh rows. Resonant scattering structures measured for the specular beam are reproduced very well by close-coupled channels calculations with a realistic potential.