Please use this identifier to cite or link to this item:
|Title:||EPR optical detection of F centre pairs in alkali halides. - I : Pumping cycle kinetics and characteristics of the resonances|
Schnegg, P. A.
Aegerter, Michel A.
|Year of Publication:||1972|
|OPUS Source:||Physica status solidi / B. - 54. 1972, 2, S. 565-576|
|SWD key words:||Elektronenspinresonanz|
|DDC notations:||500 Science|
|Publikation type:||Journal Article|
|Abstract:||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 to this record:||urn:nbn:de:bsz:291-scidok-22173|
|Date of registration:||10-Jul-2009|
|Faculty:||SE - Sonstige Einrichtungen|
|Department:||SE - INM Leibniz-Institut für Neue Materialien|
SciDok - Der Wissenschaftsserver der Universität des Saarlandes
Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.