Model for the hydrogen sorption by a metal with potential varied in a cyclic stepwise manner

Expressions are derived for theta, which is the coverage of a metal surface by hydrogen atoms occurring when the potential is varied in a cyclic stepw ise manner at different frequencies f, amplitudes, and mark-to-space ratios . It is shown that, at sufficiently high f, theta tends to a quasi-steady-s tate value which depends on the amplitude and mark-to-space ratio of a cycl ic pulse. The dependence of theta on the hydrogen diffusion in the metal is analyzed.