Zeeman Fluorescence Studies of Neodymium in Calcium Tungstate

Polarized Zeeman fluorescence spectra of triply ionized neodymium in sodium compensated calcium tungstate have been taken at 2°K. Values of $g_{\Vert }$ for the ${}^4{F}_{\text{3/2}}{\Gamma }_{\text{7,\hspace{0.17em} 8}}$ and several levels of the ⁴I ground term have been obtained. Accurate energy and polarization measurements were made, allowing assignment of S₄ irreducible representations for all 11 levels of the ⁴I_9/2 and ⁴I_11/2 multiplets. Results are found to be consistent with recent predictions from crystal field calculations employing an effective spin—orbit Hamiltonian. Summation of the $g_{\parallel }\text{'}\mathrm{s}$ for the three ${\Gamma }_{\text{5,\hspace{0.17em} 6}}$ levels of the ⁴I_11/2 multiplet yields a value of −7.53± 0.19, whereas the partial g‐sum rule predicts $G_{\text{11/2,\hspace{0.17em} 6,\hspace{0.17em} 3/2}}{\mathrm{(\Gamma }}_{\text{5,\hspace{0.17em} 6}}\text{) = − 8.69}$ and the crystal field calculations yield −8.47.