Spectrum ofSm2+: SrClF

The fluorescence spectrum of ${\mathrm{Sm}}^{2+}$ in SrClF is investigated. One hundred and two lines corresponding to the Stark components of the ${}_{}{}^5{}_{}{}^{}D_J^{}{}_{}{}^{}\to {}_{}{}^7{}_{}{}^{}F_J^{}{}_{}{}^{}$ transitions within the $4f^6$ ground configuration are identified on the basis of temperature dependence and polarization measurements. As a result, the symmetry assignment and energy of thirty-seven Stark levels belonging to the ${}_{}{}^7{}_{}{}^{}F_J^{}{}_{}{}^{}$ and ${}_{}{}^5{}_{}{}^{}D_J^{}{}_{}{}^{}$ multiplets of the $4f^6$ configuration are deduced. The experimental data (energy and symmetry of the levels) relative to the splittings of the ${}_{}{}^7{}_{}{}^{}F_J^{}{}_{}{}^{}$ multiplets are reproduced (with a deviation within the experimental precision) by an effective Hamiltonian. The resulting fitted crystal-field parameters are interpreted in the framework of the angular overlap model.