Summary
An experiment is described in which the optical absorption of theF band of a KCl crystal is modulated by means of an ultrasonic strain. If the description of the effect is based on the usual configurational co-ordinate model, the amplitude of the energy modulation of the optical transition is equal to kex0aε = 3.8ε eV, whereε is the uniaxial strain along one of the principal crystal axes,k e and x0 are constants describing the excited electronic state in the conflgurational co-ordinate model anda is the lattice constant.
Riassunto
Si descrive un esperimento in cui l’assorbimento ottico della bandaF in un cristallo di KCl viene modulato per mezzo di vibrazioni ultrasonore. Basando la descrizione di questo effetto sul consueto modello delle coordinate di configurazione, l’ampiezza della modulazione di energia della transizione ottica risulta eguale a kex0aε=3.8ε eV, doveε rappresenta la deformazione uniassiale secondo uno degli assi principali del cristallo, ke ed x0 sono le costanti che descrivono lo stato elettronico eccitato nel modello delle coordinate di configurazione eda é la costante reticolare.
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This research was made possible by a special grant of the Consiglio Nazionale delle Ricerche.
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Ascarelli, G., Barone, A. Modulation of the optical absorption of F centers in KC1. Nuovo Cim 37, 818–823 (1965). https://doi.org/10.1007/BF02773173
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DOI: https://doi.org/10.1007/BF02773173