Hydrogen-induced changes in the surface states resonances of Ni(110)

The electronic structure of hydrogen adsorbed on Ni(110) at 150 K has been studied using angle-resolved photoelectron spectroscopy with monochromatize d He I alpha radiation. Thereby, we investigated the surface states/resonan ces at the (S) over bar point of the surface Brillouin zone, which had been observed previously by Eberhardt et al. [Phys. Rev. Lett. 45 (1980) 273]. Zn contrast to their measurements concerning hydrogen adsorption, we detect marked changes in these states, which are either quenched during adsorptio n or shifted in energy. (C) 1999 Elsevier Science B.V. All rights reserved.