We determine the magnitude of phonon-induced transition interference in the ESR and far-infrared spectra of FeZ+ : MgO. The ion-lattice coupling constants required in our analysis are predicted for Fezf : MgO using the ligand superposition model. An improved formulation of the theory of spectral moments is included. The broadening component associated with phonon-induced transition interference has a sign dependent on the mechanism for the optical coupling (E2 or Ml), a temperature dependence identical to that of the conventional contributions, and a magnitude typically of 20 % of the corresponding conventional contributions.
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