| Abstrakt: |
The shape of the light absorption band by a local tetragonal center at the transition G1 ? G5(x, y) is investigated in a semiclassical approximation. In addition to interaction with fully-symmetric (G1), Jahn-Teller (G3, G4) vibrations, inter-action is also taken into account with vibrations G5, which “admix” an electron level G4(z) to the electronic state G5, which is separated from G5 by the energetic gap ?. An analytic computation of the band shape is performed in the first order of the expansion of the form function in ?-1. An asymmetric two-hump band is obtained, where the long-wave maximum always has higher intensity than the shortwave maximum. |
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