The Optical Anisotropies and the Mechanism of Vibronic Transitions in Spectra ^4A_2→^2T_2(^2D) and ^2E(^2D) of Cs_3CoBr_5 and Cs_3CoCl_5 studied by the Effect of Uniaxial Stress and the Zeeman Effect

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The g_⫽-values of the excited Kramers doublets, spectral shifts by uniaxial stress and the optical anisotropies of all the absorption-lines in the spectra corresponding to the transition ^4A_2⟶^2T_2(^2D) in Cs_3CoBr_5 and Cs_3CoCl_5 are investigated. The procedure of the assignment of the vibronic spectra is shown for the case that the electronic state is nearly degenerate and the vibronic interaction is weak enough to be treated by the perturbation method. The discrepancy in the assignment of vibronic lines in ^4A_2⟶^2T_2(^2D) of Cs_3CoBr_5 between our result and Quested et al's is shown to be due to the fact that the optical anisotropy and the MCD pattern do not reflect the symmetry of the electronic state but do that of the vibronic state. It is made clear from the optical anisotropy of vibronic lines that vibronic transitions in ^4A_2⟶^2T_2(^2D) are allowed only by the aid of the even-parity vibronic interaction, while those in ^4A_2⟶^2E(^2D) are allowed not only by the even-parity vibronic interaction, but also by the odd-parity one.
社団法人日本物理学会の論文
1976-10-15