Abstract
We present a theoretical analysis of a recent femtosecond experiment on alkali halide F-centers [1]. In the experiment, subpicosecond dynamics of an optically excited vibronic wave packet in alkali halide F-centers was investigated by a pump-probe technique using femtosecond laser pulses. The temporal evolution of the wave packet leads to damped periodic oscillations of the sample transmission. These are interpreted as the A 1 g ( Γ 1 +) breathing modes of the surrounding octahedron of cations associated with the electronic ground and excited states. It is shown that the vibrational modes of lower symmetry are responsible for the observed transient Jahn-Teller effect.
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