ANOMALOUS INFRARED REFLECTIVITY MINIMA IN CRYSTALS
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Date
1977
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Ohio State University
Abstract
The near-normal-incidence infrared reflectivity of an intense fundamental vibrational mode in a crystal is large between the transverse and longitudinal optic mode frequencies and usually exhibits no fine structure. However, in a few cases anomalous reflectivity minima are observed in the transverse-longitudinal band gap. These may be due to surface defects, surface modes, or resonant interactions between the fundamental and an overtone, combination, or a multi-phonon process. Data are presented for several crystals with anomalous reflectivity minima, including $KBrO_{3}, Na^{14}NO_{3}$, and $Na^{15}NO_{4}$. The spectra are discussed in terms of the possible explanations described above.
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Author Institution: Department of Chemistry, University of Oklahoma