Abstract
Abstract The binding energies of the ground state and the first excited state of a Ca++ impurity-vacancy complex in alkali halides have been calculated to zeroth order and are found to be within 0·2 eV of the results obtained from the simple formula e2/kr 12. A zeroth order calculation of the activation, energy for orientation of the Ca++ impurity-vacancy complex shows that this is 0·2 eV greater than the activation energy of a free cation vacancy.
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