The pre-exponential factor of the escape probability in thermally stimulated processes |
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Authors: | M. Böhm A. Scharmann |
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Affiliation: | (1) I. Physikalisches Institut, Justus-Liebig-Universität, D-6300 Giessen, Fed. Rep. Germany |
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Abstract: | The pre-exponential factor of the transition probability of a trapped charge carrier into an excited state is evaluated from two different approaches. The semi-classical treatment based on a thermodynamical concept involves the calculation of the vibrational entropy change from the partition sum. The quantum-mechanical treatment deals with non-radiative transitions due to electron-phonon coupling. The factor is found to be explicitely dependent on both the temperature and the lattice vibration frequencies represented by a single Einstein oscillator. In addition, the results from different concepts show similar behaviour. As a consequence the effect of lattice vibrations on the position as well as on the shape of glow peaks in thermally stimulated measurements are investigated on a simple phenomenological base. The analysis of some experimental results can be performed in accordance with the theoretical predictions. |
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Keywords: | 71 72.20 78 |
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