Optical absorption spectra of liquid As₂S₃and As₂Se₃over a wide temperature range

Abstract

The authors have measured the optical absorption coefficient of liquid As2S3 and As2Se3 up to 900 degrees C in a wide absorption range up to about 3*105 cm-1. They have developed an optical cell of their own design with a sample thickness of about 2000 AA. The optical gap obtained from the spectra decreases rapidly with increasing temperature, eventually becoming zero at about 950 degrees C for liquid As2Se3, where the semiconductor-to-metal transition starts to occur.