Abstract
An account of possible center’s reorientation processes is presented using the example of impurity molecules O -2 and S -2 in alkali halide crystals. Three basic mechanisms of the reorientation of the molecular axes between the equivalent potential wells both in the ground and excited molecular electronic states may be experimentally distinguished. For the centers in thermal equilibrium with the phonons of the crystal there are thermally activated jumps over the potential barrier, thermally activated tunneling through the excited librational state, and phonon-assisted tunneling from the ground librational state. Photostimulated reorientations are also observed in low temperature limits when the thermal equilibrium has not been achieved.
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© 1978 Plenum Press, New York
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Rebane, L.A. (1978). Reorientations of the Molecular Centers O -2 and S -2 in the Excited Electronic State. In: Di Bartolo, B., Godberg, V., Pacheco, D. (eds) Luminescence of Inorganic Solids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3375-3_23
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DOI: https://doi.org/10.1007/978-1-4684-3375-3_23
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