Abstract
The optical reflection from germanium surfaces has been modulated by a chopped electron beam. Magnitude and phase of this cathodoreflectance measured at low temperatures and photon energies from 2.0 to 2.8 eV turned out do depend on the modulation frequency, the excitation density, and other parameters. Two components related to different mechanisms were separated and identified as thermoreflectance and electroreflectance by free carrier production in a surface layer.
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