Excitation-Induced Atomic Motion of Self-Trapped Excitons in RbCl: Reorientation and Defect Formation

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Abstract
Effects of electron excitation of self-trapped excitons on the π-luminescence and the optical absorption due to electron transition from their lowest excited states in RbCl have been investigated. Similarly to KCl and KBr, it is found that the yield of the F centers creation is the highest when the electron is excited to the 2 p π u orbital lying in the (100) plane. The experimental results are analyzed using kinetic equations involving the non-radiative transitions between the excited states of the self-trapped exciton and the transitions to the F - H pair and to the ground state. The general trend of the non-radiative de-excitation process in RbCl is found to be similar to that in KCl, except that the reorientation is induced when the electron is excited to the 2 p π u orbital lying in the (110) plane. It is suggested that the reorientation is induced by the configuration interaction or the Auger transition in which a hole excited state is involved.

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