LASER RAMAN SPECTROSCOPY IN THE PRESENCE OF FLUORESCENCE

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1974

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Ohio State University

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A new technique based on the difference in polarization between Raman scattered and fluoresced light has been developed foe the recording of Raman spectra of samples that fluoresce. Fluorescence from impurities or trace components frequently masks the Raman spectrum of many samples and makes quantitative conventional measurements impossible. Since fluorescence lifetimes are typically much longer than molecular reorientation times in fluids, the fluorescence is isotropic, while Raman scattering of fluids possesses the well-known depolarization ratios. Therefore, by measuring the light intensities scattered parallel and perpendicularly to the polarization of the incident laser beam, and taking the difference between these two signals, one obtains a signal proportional to the depolarization ratio of the Raman scattered intensity and independent of the fluorescence background. Raman spectra of gasoline samples will be presented to demonstrate the usefulness of the technique.

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Author Institution: AeroChem Research Laboratories Inc.

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