Abstract
Hydrogen interaction with a thin Ni film was studied by measuring simultaneously the surface potential and the H2 pressure. It has been found that the negatively and positively charged adspecies coexist on the surface at low temperature (78K). The negatively charged adspecies arise at the beginning of adsorption and are stable on the surface. The induced, positively charged adspecies incorporate below the surface, becoming a precursor state of the adsorbate for the nickel hydride formation. The electrostatic interaction within the positively charged, weakly bound adsorbate influences the kinetics of hydrogen adsorption and desorption.
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