Strong-Field Assignment on 4f135d Levels of Yb2+ in SrCl2

Abstract

The $4f^{14}\to 4f^{13}5d$ absorption spectrum of an ${\mathrm{Yb}}^{2+}$ ion in cubic crystals is demonstrated to have four peaks, which correspond to the four $5d (e_g or t_{2g}) 4f^{13}({}_{}{}^2{}_{}{}^{}F_{\frac{7}{2}}^{}{}_{}{}^{} or {}_{}{}^2{}_{}{}^{}F_{\frac{5}{2}}^{}{}_{}{}^{})$ final states.