IDENTIFICATION OF ELECTRONIC BONDING STATES OF HYDROGEN ON NI(110)

The electronic structure of hydrogen adsorbed on Ni(110) at 150 K has been studied using angle-resolved photoelectron spectroscopy with mono chromatized He I alpha radiation. At a saturation coverage of 1.5 mono layers, we observe a general shift of the spectral weight away from th e Fermi level to higher binding energies indicating the hybridization of hydrogen levels with metal d states. Along selected Ni 3d bands the intensity shift is obvious whereas other bands remain unchanged. In a ddition, contrary to previous observations, a hydrogen induced state i s visible at a binding energy of roughly 1.2 eV. [S0163-1829(98)50244- 5].