Abstract
Absorptance and spectral response of the photoconductivity data indicate the absorption edge in $a\ensuremath{-}\mathrm{G}\mathrm{e}$ is near $h\ensuremath{\nu}=0.6$ eV and not at 1 eV as suggested by other studies. The position of the optical threshold is obtained from in situ measurements on ultrahigh-vacuum---deposited films and is within experimental error of the thermal activation energy determined as the sum of the separation of the Fermi energy from the valence band and the high-temperature activation energy of the dc conductivity.
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