Analysis of the Absorption Spectrum and Zeeman Effect of Thulium Ethylsulphate

Abstract

The crystalline field interaction was calculated using first‐order perturbation theory on intermediate coupling wave functions of Tm³⁺ in a D_3h field. Good agreement with experimental data of Tm³⁺ diluted with La(C₂H₅SO₄)₃·9H₂O was obtained. The following crystalline field parameters were chosen for best fit: $$A_2^0{\mathrm{〈r}}^2\text{〉=129.8\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}{\mathrm{,A}}_4^0{\mathrm{〈r}}^4\text{〉=−71.0\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}{\mathrm{,A}}_6^0{\mathrm{〈r}}^6\text{〉=−28.6\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}{\mathrm{,A}}_6^6{\mathrm{〈r}}^6\text{〉=432.8\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}.$$