Abstract
Angular resolved ultraviolet photoemission spectra (ARUPS) of InSb(001) and of heteroepitaxial grown α-Sn(001) films are reported for the first time. Results from normal emission spectra are explained by direct transitions into a parabolic free-electron-like final states band. The experimentally obtained dispersion E( k) along ΓX agrees well with the non-local Pseudopotential band structure calculation by Chelikowsky and Cohen. Other band structure calculations of α-Sn exhibiting smaller dispersion of the first valence band towards the X 5 point fail to explain the photoemission data.
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