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Measurement of the Angular Distribution of Photoelectrons from Third Generation Photocathode Materials,
ARMY ELECTRONICS COMMAND FORT BELVOIR VA NIGHT VISION LAB
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The experimental measurements of the angular distribution of photoemitted electrons from cesium-oxygen activated p-type GaAs surfaces shows a highly directional photoemission approximately independent of the surface orientation. The mathematical model explaining these observations shows the expected Lambertian distribution is modulated by a strong exponential function resulting from the attainment of negative electron affinity conditions.
APPROVED FOR PUBLIC RELEASE