Elastic scattering of the conduction electrons by adsorbed hydrogen

The cross section of adsorbed hydrogen for the conduction electrons is evaluated according to the Boltzmann-Fuchs equation, the Greene and Soffer theories for surface scattering of the conduction electrons and to the change of the electrical resistivity due to hydrogen adsorbed on evaporated nickel films obtained experimentally by Suhrmann et al. The calculated cross sections are 2.0 × 10^?15 cm² and 1.8 × 10^?15 cm² at 273°K and 90°K respectively at a low coverage of hydrogen, which are consistent with the theoretical value 3.0 × 10^?15 cm² by Toya and reasonable compared with 0.9 × 10^?15 cm², the cross section of a gaseous hydrogen atom. The cross section decreases with increase of the coverage. This change is considered to be closely related to that of the heat of adsorption.