Abstract
Peaks in the uv photoelectron spectra from single crystal surfaces of yttrium which cannot be ascribed to the one-electron states in band structure calculations have been recently interpreted as due to hydrogen contamination. The evidence for this suggestion, however, is based on an erroneous comparison between the results of UPS experiments on polycrystalline samples exposed to hydrogen and previously published spectra from single crystal samples. In this paper we show how the spectra have been misinterpreted and comment on the consequences concerning the origin of the peaks.
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