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Photostimulated Electron Emission Spectra of Vacuum‐Ultraviolet‐Irradiated Ionic Crystals
Author(s) -
Bichevin V.,
Käämbre H.
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.19690310208
Subject(s) - exciton , electron , irradiation , ultraviolet , ionic bonding , vacuum ultraviolet , spectral line , ionic crystal , atomic physics , materials science , emission spectrum , ultraviolet light , electron beam processing , chemistry , photochemistry , optoelectronics , ion , physics , condensed matter physics , organic chemistry , quantum mechanics , astronomy , nuclear physics
By the investigation of the spectral characteristics of photostimulated electron emission it has been shown that F‐centres are created in NaCl, KCl, KBr, and KI single crystals by ultraviolet irradiation in the 5 to 11 eV region. The F‐centres are formed as a result of the photoproduction of excitons as well as electron–hole pairs, the exciton mechanism being especially effective. Under stimulation with visible light, electron emission appears from UV‐created F‐centres due to a two‐step photothermal process in crystals with sufficiently low electron affinity χ and by the usual photoemission mechanism in crystals with relatively high χ.