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Energy distribution spectra of photoelectrons emitted normal to a (100) plane of tungsten show a pronounced peak located 0. 4 eV below the Fermi level, which is attributed to surface states. It is very sensitive to gas adsorption and disappears as the surface is saturated with hydrogen in the ₂ state, corresponding to a coverage of 2. 510^14 molecules/cm^2.
Feuerbacher et al. (Mon,) studied this question.
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