Infrared Lattice Vibrational Spectra of AgCl, AgBr, and AgI

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Abstract
The infrared transmission spectra of AgCl, AgBr, and AgI have been measured between 400–30 cm−1 at room temperature and at 143°K. Strong absorptions characteristic of the transverse optic modes were found, together with weak subsidiary absorptions arising from multiphonon combinations. The longitudinal optic modes of silver chloride and silver bromide were obtained from the reflection spectra of thin, silver halide films deposited on a silvered substrate. Capacitance measurements were used to determine the static dielectric constant of AgI; ε0=7.0±0.3. For a series of isomorphous I—VII compounds having large reduced masses, approximately linear relations are found between νt2 and the reciprocal reduced masses. The Szigeti relations for effective charge and compressibility were calculated and their significance is discussed.

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