Second-Order Vibration Spectra of Amorphous As–Se Systems

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Abstract
The infrared absorption spectra of amorphous As x Se1-x systems (0≤x≤0.5) were measured in the wave number range 300–600 cm-1 at room temperature, and one-mode type behaviours of the absorption bands were observed. The absorption spectra have broad bands near 490 cm-1, and the spectral shape is well reproduced by the effective self-convolution of the phonon density of states. The absorption coefficient has a maximum value at the stoichiometric composition As2Se3, in good correspondence with that of the main band near 225 cm-1. Hetero-bondings and pyramidal units are predominant in these systems.