Properties of Hydrogen Chemisorbed on Tungsten

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Abstract
The sticking probability of hydrogen on a single crystal tungsten ribbon was measured as a function of the number of adsorbed atoms. The work function of the same ribbon was measured by a photoelectric technique. The results indicate that during the initial fast chemisorption characterized by an almost constant sticking probability of approximately, 0.2 the work function rose from 4.54 ev for the clean surface to a maximum value of 5.0 ev for the covered surface. The maximum coverage at room temperature was (7.5±1.0)×1014cm−2.Evidence for two states of adsorption is presented and the experimental techniques, used in these and earlier experiments, are described in some detail.

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