Induced Far-Infrared Absorption in Mixed Alkali Halide Crystals

FAR-INFRARED ABSORPTION DUE TO IMPURITIES IN CsBr CRYSTALS

Clustering of divalent cation-vacancy pairs in alkali halide crystals

The analysis of experimental results of the clustering of divalent cation-vacancy pairs by Unger and Perlman is shown here to be unable to distinguish between their model of dimer formation and the earlier model of' Dryden for trimer formation under the conditions where it has been applied. In general, experimental results appear to correspond to overall third order kinetics in the pre-plateau ...

Infrared Absorption Properties of LiH, LiD Mixed Crystals

Far-infrared Absorption by Small Particles

Detailed far-infrared (FIR) and mid-infrared (MIR) studies of aluminum small particles have been carried out. MIR absorption studies of clustered and non-clustered samples suggest that the anomalous FIR absorption does not arise from the clustering together of the individual metallic particles. The MIR absorption, which is too small to be the continuation of the anomalous FIR absorption, could ...

Phonon Combination Bands in the Far-Infrared Spectrum of K0.5Rb0.5I Mixed Crystals

Introduction Critical point analysis of phonon combination bands in the far-infrared spectra have been widely used to establish precise values for alkalihalide phonon frequencies at major symmetry points in the Brillouin zone /1 to 4/. The high resolution available in far-infrared measurements enables more accurate determination of phonon frequencies than it is possible using neutron scattering...