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Effect of polarization and geometric factors on quantitative laser-induced fluorescence- to-Raman intensity ratios of water samples and a new calibration technique

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Abstract

A 266-nm laser-induced fluorescence system was used to study the effect of polarization of the excitation source and geometry of the collection optics on the ratio of the signal from a fluorescence standard, quinine sulfate, and the Raman scatter from water. Although the ratio is sometimes considered to be a constant and is used for intersystem comparisons, our studies showed that the Raman signal and, thus, the ratio can vary by a factor of up to 3.6. These experimental values agree with previous studies by others involving gas and flame Raman spectroscopy and suggest a new calibration method for intersystem comparison of different fluorescence systems.

© 2003 Optical Society of America

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