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Thermosensitive Discontinuities and Hystereses of the Photoemission of Alkali–Antimonide Cathodes at High Light Intensities
Author(s) -
Hora H.,
Kantlehner R.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690330221
Subject(s) - photoelectric effect , cathode , atomic physics , electron , antimonide , classification of discontinuities , materials science , helium , absorption (acoustics) , optoelectronics , chemistry , physics , quantum mechanics , mathematical analysis , mathematics , composite material
Anomalies of the dependence of the photoemission from multialkali and Cs 3 Sb cathodes on temperature between 12 and 300°K were analysed. The sublinearities, discontinuities, and hystereses of the emission current at varying intensities were measured in dependence on the spectral properties of the incident light, temperature of the cathode, time, geometry of illumination, preillumination and, partial pressure of helium. We find the optical absorption independent of the effects and conclude that the mechanism does not depend on the decreased dark conductivity of the non‐illuminated cooled cathode. An explanation is possible on the base of an increase of the surface potential due to trapped photoelectrons, creating consequently an electric field in the border zones of illumination where charge transport processes excite and emit additional electrons.