Electronic Processes in the Off-Centre Instability for Cu^+ Impurity Ions in Alkali Chlorides
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The off-centre instability for Cu" impurity ions in alkali chlorides was studiedusing a model that the ground state with A., symmetry and a localized excitedstate with T.. symmetry mix with each other through the odd-mode electron-lattice interaction. In addition, an absorption lineshape due to a transition fromthe ground state to an even-parity state was calculated. The instability and theoptical properties of the Cu' ion revealed through earlier empirical works areexplained by this model. Among possible candidates for the Tg. state, a charge-transfer excitation state between the Cu" and the neighbouring C1= is concludedto play an essential role in the optical properties and the off-centre instability.
- 社団法人日本物理学会の論文
- 1981-05-15
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