MOLECULAR SPIN-ORBIT INTERACTION FOR D(5) IONS IN CRYSTALS - SPIN-LATTICE COUPLING-COEFFICIENTS AND FIRST-ORDER SPIN-ORBIT INTERACTION FOR THE FLUORESCENT LEVELS OF D(5) IONS

The first-order spin-orbit (SO) interaction for the fluorescent T-4(1) -levels of Mn2+ in the common cation series ZnX (X: S: Se, Te) has bee n calculated by using the molecular SO interaction H-SO mol and a very elaborated ligand-field (LF) model. With respect to the splittings pr edicted by the crystal-field (CF) model, the first-order SO splittings are Very strongly reduced for Mn in ZnS, while for Mn in ZnSe and ZnT e, the splittings are inversed and strongly enhanced. A theoretical ch eck of the validity of the LF model is performed by relating the matri x elements of the total angular momentum for the monoelectronic wave f unctions 2e and 2t(2) which intervene in the calculation of the matrix elements of the first-order SO interaction to those which intervene i n the calculation of the spin-lattice coupling coefficients (SLCC). An other check of the validity of the LF model from a previous analysis o f the four vibronic lines of the fluorescent lever of Mn2+ in ZnS is b riefly recalled.