Properties of Cold Condensed Metal Chlorideand of Cocondensed Metal/Metal Chloride Films II. Raman Spectra

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Abstract
We report on Raman spectroscopic investigations with cold condensed films of silver chloride, thallium chloride, and sodium chloride in the absence and in the presence of cocondensed metal. With films of 1000 nm -2000 nm thickness, Raman signals only can be seen if small silver particles are present. These are either cocondensed particles or they are formed by photolysis of silver chloride. At low temperatures, noncrystalline films can absorb light from the exciting laser, while at room temperature also crystalline silver chloride can be photolyzed by the argon ion laser. The signals are interpreted as surface enhanced Raman transitions of a chloride - silver vibration. No indications for the presence of silver chloride or thallium chloride molecules can be found from the spectra.

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