The infrared absorption spectra of Ce3+in LaF3and of CeF3have been observed in the region of 3 to 6 mgr;. The four absorption lines for Ce3+in LaF3at 2160, 2240, 2635, and 2845 cmminus;1that persist at liquidhyphen;helium temperature are identified as transitions originating on the ground Stark component of the2F5/2and terminating on the four Kramershyphen;degenerate Stark levels of the2F7/2. Observation of the temperature dependence of the spectrum has revealed two additional transitions beginning on a2F5/2Stark level 150 cmminus;1above the ground state and ending on the two lowest levels of the2F7/2. The results are essentially the same for CeF3and are in substantial agreement with the results of temperaturehyphen;dependent studies of the magnetic susceptibility and Faraday rotation of CeF3and tysonite.
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