Comparison of Rama and ATRFTIR Spectroscopy of Aqueous 拉曼光谱和水的ATRFTIR光谱比较.docVIP

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Comparison of Rama and ATRFTIR Spectroscopy of Aqueous 拉曼光谱和水的ATRFTIR光谱比较.doc

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Comparison of Rama and ATRFTIR Spectroscopy of Aqueous 拉曼光谱和水的ATRFTIR光谱比较

Comparison of Raman and ATR-FTIR Spectroscopy of Aqueous Sugar Solutions Terry A. Ring Chemical Engineering University of Utah 50 S. Central Campus Dr. MEB 3290 Salt Lake City, UT 84112 Abstract The infrared and Raman spectra of aqueous sugar solutions are compared. The Raman spectroscopy more accurately measures the concentration of two sugars in aqueous solution than does the Fourier transform infrared spectroscopy using an attenuated total reflection cell. The unknown aqueous solution has a concentration of 231.1+/-25.8 gm/L sucrose and 279.7+/-4.8 gm/L fructose. Introduction Vibrational spectroscopy measurements of carbohydrates in aqueous solution is obscured in infrared transmission due to strong absorption by the solvent, water, below 900 cm-1, from 1,400 to 2,500 cm-1 and above 3,000 cm-1. Attenuated total reflection (ATR) infrared cells are suggested as the best option to measure spectra for aqueous solutions. This study compares the results of Fourier transform infrared spectroscopy using an attenuated total reflection cell (ATR-FTIR) with the results of Raman Spectroscopy for concentrated sugar solutions. With reflection based infrared spectroscopy infrared light is projected onto a sample and the reflected light measured. Some of the infrared light is absorbed by the sample at wavelengths (measured in wavenumber units) where molecular vibrations take place. With Raman spectroscopy, a high power laser of a very specific wavelength shines on the sample. At 90 degrees the scattered light not at the same wavelength as the laser is observed. The incident laser light is scattered with some of the energy either lost (anti-Stokes radiation) or gained (Stokes radiation) from molecular vibrations. While infrared and Raman effectively measure the same molecular vibrations, there are differences in the laser activation efficiency of the different molecular and for the molecular vibrations to emit Stokes radiation, which is not the case with infrared spec