Abstract

We combine persistent IR spectral hole burning with high-resolution Fourier-transform interferometry to observe IR spectral changes far from the laser burn frequency for NO₂⁻ and NO₃⁻ ions in KI single crystals. Three separate vibrational mode types are investigated, and information about the symmetries of the modes is obtained. First the technique is used to separate isotopically modified and mixed stretch modes. Isotope-dependent complex structures in the NO₂⁻ν₁-and [ν₁ + ν₃]-mode regions appear to arise because of resonances between ν₁ and [ν₃ + phonon sideband] modes. Phonon-gap-mode sidebands on the NO₂⁻ν₃ mode are examined and compared with results from far-infrared and Raman scattering studies. The number of resolved KI:NO₂⁻ gap modes is increased to five, and the translational and librational character of these modes is discussed in terms of their symmetry assignments. Defect-cluster lines of NO₂⁻: are hole burned, and many related satellite lines are observed to change. New assignments for NO₂⁻: NO₂⁻ defect pairs and lines belonging to single NO₂⁻ defects associated with near-neighbor alkali or halide defects are made. Satellite lines NO₃⁻ are also found to hole burn, and changes in these modes produce changes in additional NO₂⁻ satellite lines. Hence defect clusters involving both NO₂⁻ and NO₃⁻ ions are identified also.

© 1992 Optical Society of America

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