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Titel: EPR optical detection of F centre pairs in alkali halides. - I : Pumping cycle kinetics and characteristics of the resonances
Verfasser: Ruedin, Y.
Schnegg, P. A.
Jaccard, C.
Aegerter, Michel A.
Sprache: Englisch
Erscheinungsjahr: 1972
Quelle: Physica status solidi / B. - 54. 1972, 2, S. 565-576
SWD-Schlagwörter: Elektronenspinresonanz
Detektion
Elektrochemische Kinetik
Kinetik
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumentart : Journalartikel
Kurzfassung: The EPR of F centres in the ground and excited states was optically detected in the following alkali halide crystals: NaCl, KF, KCl, KBr, KI, RbBr, and RbI. A decrease of the radiative quantum efficiency of the F centre luminescence was observed when microwave transitions were induced between the spin levels. The mechanism responsible for this effect was an electronic tunnelling through the crystal field potential; the electron in the relaxed excited state of an F centre (F~*) is transferred nonradiatively to another nearby F centre in its ground state (F0), and leads to the momentary formation of an ¿ and an F' centre. Such a process is a function of the total spin of the F~*-F0 pair. The role played by the paired centres was confirmed by measurements at different F centre concentration. Moreover, at high optical excitation pumping rates, the population of the intermediate complexes (F'- ¿) is large enough to allow an estimation of the rate of the reverse process F' + ¿ '¨ F0 + F0.
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-22173
hdl:20.500.11880/24127
http://dx.doi.org/10.22028/D291-24071
SciDok-Publikation: 10-Jul-2009
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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