Abstract
Abstract Analysis of the Far-Infrared reflectivity spectra of SbSI, SbSBr and their solid solutions reveals strongly asymmetric phonon line shapes and attemps to fit the spectra with the harmonic-oscillator dispersion relation with constant damping, in the sum or factorised form, failed. The data are consistent with a peac at ∼ 40-50 cm-1 in the two-phonon density of states which contributes to the reflectivity spectrum via an cubic anharmonic mechanism involving the frequency-dependent phonon self-energy of the anharmonic soft mode. The real part, frequency shift Δ(ω) and the imaginary part, the damping function γ(ω), of the self energy are calculated and theese data are used via a simple model, to obtain best fits to the reflectivity spectra.
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