Please use this identifier to cite or link to this item: doi:10.22028/D291-24069
Title: F+2-center in potassium chloride crystals. - Part I : Formation and bleaching kinetics
Author(s): Aegerter, Michel A.
Lüty, Fritz W.
Language: English
Year of Publication: 1971
OPUS Source: Physica status solidi / B. - 43. 1971, 1, S. 227-243
SWD key words: Kinetik
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: A quantitative analysis of the higher transitions of the M center in the UV at ¡Ü5.0 eV in KCl crystals with a high [M]:[F] ratio and unaligned and aligned M center shows several new excitations (LM bands). Assuming that the LM excitation leads to conductive states, a simple electron kinetic model shows that UV irradiation of the F + M center system produces ionized F and M center (¦Á and F2+) while competing capture processes partially destroy them or form F' and M' center. The F2+ center production spectrum should closely follow the absorption ratio of LM:LF while the bleaching spectrum should follow the F' and M' spectrum. Experimental confirmation of this model is presented. By x-raying the crystal (containing F + M centers) at LHeT, extra electron traps are introduced into the crystal and shift the equilibrium of the reaction to higher amount of F2+ center, which are not stabilized by F' and M' centers. These extra F2+ center anneal out near 40¡ãK in parallel with the 3rd stage annealing of x-ray produced ¦Á-center-interstitial anions.
Link to this record: urn:nbn:de:bsz:291-scidok-22143
Date of registration: 9-Jul-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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