Energy levels of Ho3+ in HoCl 3–6
Abstract
The 5S2, 5F4, 5F2, 3K8, 5G6, 5F1, 5G5â†�5I8 absorption spectra of Cs2NaHoCl6 have been recorded at temperatures down to that of liquid helium and new assignments are made for the 5S2, 5F4, 3K8 and 5G5 terms of HoCl3–6. The 5F3→5I8; 5F4, 5S2→5I7, 5I8 and 5F5→5I7 luminescence transitions of HoCl3–6 in various elpasolite lattices are reported and assigned, together with luminescence decay measurements. Including the previously reported data, these results enable 57 of the first 60 crystal-field levels of HoCl3–6, comprising 14 LJ terms, to be firmly assigned and tentative assignments are made for the remaining three levels. The agreement between the calculated and observed crystal-field splittings is reasonable.