Two-photon spectroscopy of samarium(III) in the elpasolite Cs2NaYCl6:Sm3+

We present polarized two-photon excitation (TPE) spectra for samarium(III) f5 in the elpasolite Cs2NaYCl6. Approximately 80 levels have been assigned up to 29 000 cm-1 with the aid of a one-electron crystal field Hamiltonian, representing the most complete and extensive data set so far reported for Sm(III) at a cubic site. Deviations from the predictions of one-electron theory are discussed in terms of the spin correlated crystal field (SCCF).