Abstract
The radiative decay of an exciton bound to a substitutional iodine ion in AgBr is investigated theoretically. The vibronic spectrum showing multiphonon replicas is calculated under the assumptions of linear electron-phonon coupling. The experimental intensity of the one-phonon spectrum as a function of frequency could satisfactorily be reproduced only by considering coupling coefficients up to fifth neighbors. This result indicates that the bound exciton influences the dynamics of the lattice over an extended neighborhood of the iodine.
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