Variation in the Yield of Photoelectrons Emitted from (111) and (\bar1\bar1\bar1) Surfaces of a Gallium Phosphide Crystal with the Diffraction Condition of X-Rays

Abstract

Difference in the yields of electron emission from (111) and (\bar1\bar1\bar1) planes of a polar crystal of gallium phosphide is studied under the diffraction condition of X-rays. The symmetric 111 and \bar1\bar1\bar1 Bragg-case diffractions are used in the double-crystal arrangement of (+, −) setting for Cu Kα radiation. Profiles of the yield curve of Ga L-photoelectrons obtained for two polar planes differ markedly from each other because of the difference in the X-ray wave fields formed in the crystal.