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Titel: F+2-center in potassium chloride crystals. - Part I : Formation and bleaching kinetics
Verfasser: Aegerter, Michel A.
Lüty, Fritz W.
Sprache: Englisch
Erscheinungsjahr: 1971
Quelle: Physica status solidi / B. - 43. 1971, 1, S. 227-243
SWD-Schlagwörter: Kinetik
Chloride
Kristall-Engineering
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumentart : Journalartikel
Kurzfassung: 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 zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-22143
hdl:20.500.11880/24125
http://dx.doi.org/10.22028/D291-24069
SciDok-Publikation: 9-Jul-2009
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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