Abstract
We study the influence of the electron-optical phonon coupling on a donor like exciton for which the hole is localized at the centre of a spherical microcrystal. This work is performed within the envelope function approximation considering a non degenerated conduction band. The quantum confinement is described by an infinitively deep potential well. The electron-optical phonon coupling is treated within the adiabatic approximation. We determine the Huang-Rhys factor using a one parameter trial wave-function which allows to include the electron-hole correlation. The theoretical model is compared to experiment.
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