Abstract
On the basis of the localized excitation model, characteristic absorption spectra of excitons in alkali halides in the range of photon energy around 20 eV corresponding to the n p 6 → n p 5 n ' s and n p 6 → n p 5 n d excitations of alkali ions are theoretically treated by using methods developed in the ligand field theory. By assuming reasonable values of Slater integrals, the spin-orbit interaction constant and the ligand-field strength, the observed positions including their chemical shifts and the relative intensities of five absorption peaks called A , B , C , D and E in RbX(X=F, Cl, Br, I) are explained satisfactorily. In constant to the case of the band picture, the excited d -orbital responsible for the absorption of RbX is shown to be mainly of the d γ character, although mixing of the p 5 s , p 5 d e and p 5 d γ configurations is appreciable.
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