Abstract

A new method for trace analysis of gases, based on the pulsed photoacoustic Raman spectroscopy (PARS) technique, is described. The method has been applied to the analysis of mixtures of CH₄ in N₂, CO₂ in N₂, and N₂O in N₂ at concentrations near 1 ppm. The apparatus used is described in some detail. Means of improving the method’s sensitivity as well as sensitivity-limiting processes are evaluated. The analytical capabilities of this technique are compared with both direct (IR) absorption and other Raman techniques such as CARS and stimulated Raman gain spectroscopy (SRGS).

© 1980 Optical Society of America

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