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 β₂ state, corresponding to a coverage of 2.5×{}10¹⁴ molecules/cm².
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Feuerbacher et al. (1972) studied this question.
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