VARIATION IN THE YIELD OF PHOTO-ELECTRONS EMITTED FROM (111) AND (111) SURFACES OF A GALLIUM-PHOSPHIDE CRYSTAL WITH THE DIFFRACTION CONDITION OF X-RAYS

Difference in the yields of electron emission from (111) and (111) planes of a polar crystal of gallium phosphide is studied under the diffraction condition of X-rays. The symmetric 111 and 111 Bragg-case diffractions are used in the doublecrystal 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. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.