Three-photon magnetoabsorption measurements in fields up to 9 T are presented for the first time. A narrow exciton line of Γ₅^- symmetry is resolved in CsI at 5.8076 eV. A g value of 1.17 is deduced from the Zeeman splitting of this exciton. At high magnetic fields an exciton of Γ₃^- symmetry is detected. The analysis of the field-dependent mixing of the Γ₃^- and Γ₅^- excitons yields a zero-field shift of the Γ₃^- exciton to lower energies of 0.54 meV and an effective g value for the admixture of 1.20.
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Beerwerth et al. (1986) studied this question.
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