Abstract
We used coherent anti-Stokes Raman scattering (CARS) spectroscopy tostudy the symmetry of the low-lying levels of the Sm2+ ion doped in sites ofcubic (Oh) symmetry in the SrF2 and CaF2 matrices. Taking advantage of thepolarization sensitivity of the Raman spectroscopic techniques, we confirmthat the line at ≈652 cm-1 (that we could only observe in the SrF2 casebecause of wavelength limitations) corresponds to excitation from the ground(4f6 7F0) A1g level to the Stark T2g level originating from the splitting ofthe (4f6 7F2) multiplet. In the same SrF2 sample, the(4f6) 7F0→ 7F1 transition was observed to be weaker. In CaF2 matrices in which it is moreeasily detected, we checked its T1g symmetry.
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