Abstract
A review is presented of the worked out earlier method that uses ultrasonic experiments to evaluate Jahn-Teller effect (JTE) parameters, mostly linear vibronic coupling constants, in application to impurity centers of dopant crystals. The method employs temperature dependent ultrasound attenuation and phase velocity measurements. Distinguished from previous attempts to detect the JTE parameters by ultrasound, this method does not assume any specific mechanism of relaxation, and hence it can be applied to any JTE problem, irrelevant to its complicated dynamics of distortions. It is shown that by combining the ultrasound results with some additional information about the JT stabilization energy obtained from independent sources, the whole adiabatic potential energy surface of the JT center can be evaluated. Two examples of application of this method relevant to two JTE problems are considered, both for impurity centers in crystals with zinc-blend structure and tetrahedral coordination of the impurity ion: ZnSe:Fe2+ with the E⊗e problem and ZnSe:Cr2+ with a T term and the T⊗(e+t 2) problem.
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