Abstract
A theoretical model was developed for the line shape of magnetic-resonance absorption for transitions within a non-Kramers doublet (the term doublet is used here to denote the $|\ensuremath{\Delta}{M}_{s}|=2$ transition within a ground triplet) for the point-group symmetries ${C}_{3v}$ and ${O}_{h}$. This was done for both the acoustical-paramagnetic-resonance and the electron-paramagnetic-resonance line shapes. The asymmetric broadening of the absorption distribution is interpreted on the basis of the spin-lattice coupling. For the case of ${C}_{3v}$ symmetry, the calculation was done for both electric-rf-field-induced and magnetic-rf-field-induced transitions, the necessary condition for the former being a lack of inversion symmetry.
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