“…In the present study, the emission spectra of the tripositive ions of Sm, Gd, Tb, Ho, and Er excited by synchrotron radiation at $10 K are presented and detailed interpretations are provided where possible. There have been some previous 4f N -4f N emission results reported for hexafluoroelpasolite systems comprising Nd 3+ [3], Eu 3+ [4], Tb 3+ [5,6], Er 3+ [7], Tm 3+ [8], and Yb 3+ [9], and experimental results and/or theoretical simulations of 4f N M 4f NÀ1 5d spectra were reported for Ce 3+ [10,11], Pr 3+ [12], Nd 3+ [3], Er 3+ [13], and Tm 3+ [13,14]. [4].…”