Abstract

Within the framework of a two-parameter octahedral potential for a dipolar impurity in ionic crystals, it is possible for the impurity to possess minimum-energy orientational configurations in two crystallographic directions simultaneously. Two possible combinations are 〈111〉-〈110〉 and 〈111〉-〈100〉. Theory for the effect of stress on tunneling levels for these two models has been developed in this paper and an attempt has been made to explain the tunneling structures in the vibrational absorption of a ${\mathrm{CN}}^{\mathrm{\ensuremath{-}}}$ impurity ion in KCl, KBr, KI, and RbCl crystals on the basis of these models without incorporating the soft aspects.

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