Abstract

Instrumentation for measuring the energy distribution of photoelectrons as a function of emission angle from the cathode normal is briefly described. Data were obtained at pressures near 10−6 Torr for high-work-function polycrystalline metal cathodes of Al, Ni, Cu, and W, irradiated at several wavelengths between 460 Å and 1048 Å. The energy distribution curves appear to show a selective attenuation of lower energy photoelectrons as the emission angle is increased from the surface normal. Preliminary angular distribution curves for Ni are approximately cosine in nature, but those for Al exhibit departures from a cosine distribution.

© 1974 Optical Society of America

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