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Simple Crystal Powder Source for Raman Spectroscopy

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Abstract

The design features desirable in a Raman source for the study of crystalline powders are analyzed. The analysis shows that the best simple source is a helical arc equipped with suitable chemical filters.The Raman tube should be in the shape of a cone fitted to the spectrograph aperture. The Rayleigh line is to be suppressed with a band-stop filter based on multilayer interference filters used in reflection.

A source based on these principles was designed, constructed, and tested with a variety of crystalline powders. Results were good except for very fine powders which yielded poor spectra. Exposure times were one to six hours.

Fluorescent and colored samples are still beyond the reach of this source. For such samples, the use of a yellow exciting line with suitable filters is recommended.

© 1959 Optical Society of America

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