Selection Rules for R-Center Absorption

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Abstract
A recent observation that apparent vibronic fine structure in the R2 absorption band of the R center in alkali halide crystals corresponds energetically to certain lattice phonons at the Brillioun zone boundary is considered in the light of possible selection rules for optical absorption. A perturbation calculation is employed. The selection rules found are not inconsistent with the lattice‐phonon interpretation, but they do not characterize or allow identification of the fine structure.