Luminescence from Superexchange-Coupled Cr^<3+> Ion Pair in Binuclear Complex Salts. : II. Theoretical Considerations

概要

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The experimentally observed sharp line luminescence from Cr^<3+> ion pair in binuclear complex salts, described in part I, is interpreted theoretically by taking account of the splitting of the ground and excited states of Cr^<3+> ion due to an anisotropic exchange interaction of the type J_0s^a・s^b+Js_z^as_z^b. Employing Sugano and Tanabe's theory, we have obtained the energy levels and transition dipoles from the symmetry consideration. The parameters were adjusted so that the best fit between the experimental results and the theoretical analysis is given. The observed spectra were thus well interpreted as being due to the transitions of Cr^*(^2E)Cr(^4A_2)⇾Cr(^4A_2)Cr(^4A_2) between the states of different total spins. From this we estimated the values of J_0 which are consistent with those obtained from magnetic measurement, though some discrepancy was found for basic rhodo-chloride. It was also suggested that the weak lines found in the excitation spectra at 4°K are caused by the two ion excitation mechanism.
社団法人日本物理学会の論文
1970-01-05