Adsorption-Site Location by Transmission Channeling: Deuterium on Ni(100)

Abstract
It is demonstrated that transmission channeling may be applied to determine positions of atoms adsorbed on clean crystal surfaces under UHV conditions. For the case of deuterium on Ni(100), we conclude that the D atoms are adsorbed in fourfold hollow sites at 0.5 ± 0.1 Å above the first Ni layer and obtain a value of the rms displacement parallel to the surface in qualitative agreement with a delocalization model.