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Studies of the well-resolved triplet line shape of the F band in cesium fluoride and its temperature dependence, magnetic circular dichroism, and stress-induced behavior are reported. The results are in accord with the picture proposed by Moran, in which the triplet structure results from a combined spin-orbit coupling and Jahn-Teller effect in the excited states, although an accurate numerical calculation of the line shape predicted by his adiabatic model shows certain features not found experimentally. The circular-dichroism results show that the contribution of the T^ lattice modes to the F-band second moment is «15%. This relatively weak coupling, taken along with the spin-orbit stabilization of the Tz g and T^ mode interactions, results in the component bands of the line shape being quite narrow. These narrow bands are comparable in width to optical-phonon energies in cesium fluoride, so that discrete optical-phonon transitions are observed in the F band.

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