Abstract
Certain semiconductors and ionic salts can be made amorphous only under drastic quenching conditions, such as vapour deposition on to a cold substrate. Studies of light scattering by such thin films are most efficiently undertaken using waveguide methods. A prism-film coupler has been developed that can be incorporated into a conventional optical cryostat. Evaporation of the films, optical absorption measurements and trapping of the laser beam in the thin sample film can be performed without breaking the vacuum. This new technique has been used to record for the first time the polarised and depolarised Raman spectra of a non-crystalline BaFCl film condensed on to vitreous silica at liquid nitrogen temperature.
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