Abstract

The efficiency of the stimulated Raman gain scattering (SRGS) in liquids is sufficiently high to make the phenomenon useful as a means of chemical analysis. Quantitative and qualitative studies of stimulated Raman gain detected by photothermal probe beam deflection are presented with a major simplification in instrumentation for generating the Stokes probe beam. This technique is evaluated for the detection and quantitation of a model chlorinated hydrocarbon, 1,1,1-trichloroethane. With a very modest laser pulse energy of 1.5 mJ (average power of 1.5 mW) and a pathlength of 10 cm, the technique is useful for the noninvasive, realtime monitoring of SRGS-active compounds at the 10 mM level. Selectivity against 1,1,2-trichloroethane, 1,2-dichloroethane, trichloroethylene, ethylbenzene, and benzene is excellent. Direct identification and simultaneous determination of individual compounds in process and effluent streams could be attained without sampling, separations, or other pretreatment procedures.

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