Far Infrared Optical Properties of Amorphous As–Se System

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Abstract
The far infrared reflection spectra of amorphous As x Se1-x systems (0≤x≤0.5) were measured in the wavenumber range 30–500 cm-1 at room temperature, and one-mode type behaviors of the dominant modes were observed. The optical constants were calculated by Kramers-Kronig analysis, and were also analyzed by the classical oscillator models. The effective charges of the AsSe3 pyramidal units were calculated. The dependence of the infrared dominant modes on the As concentrations show that hetero-bondings and therefore pyramidal units are predominant in this system, and slight modifications of the molecular models are necessary to explain the experimental data.