Slit-Function Corrections Applied to Laser-Excited Raman Bands of Liquids

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The use of small spectral slitwidths complicates Raman intensity measurements of laser-excited spectra. The nature of the slit-function correction in medium-resolution laser-Raman instruments is discussed and some effects of asymmetric slit functions on asymmetric and symmetric Raman bands are explored. Corrections to bandwidth and band shape for nonideal slit functions are obtained from the concept of an intermediate standard which represents the pure slit function at some limiting spectral slitwidth. The corrections are applied to the contours of the Raman bands of CCl4 at 458 cm−1 and CH3OH at 1028 cm−1, and the corrected contour of the 1028-cm−1 band is compared to that obtained for the same band on a high-resolution laser-Raman spectrometer. A codification of Raman band shapes by means of two shape parameters is discussed.

Keywords: Convolution; Intensities; Raman

Document Type: Research Article


Affiliations: Department of Electrical Engineering, University of Kentucky, Lexington, Kentucky 40506

Publication date: November 1, 1971

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