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By Richard L. McCreery
Due to its targeted mixture of excessive details content material and simplicity of use, Raman spectroscopy, which makes use of assorted vibrational strength degrees to excite molecules (as against mild spectra), has attracted a lot cognizance during the last fifteen years. This ebook covers all facets of recent Raman spectroscopy, together with its starting to be use in either the laboratory and commercial research.
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Extra info for Raman Spectroscopy for Chemical Analysis
Example text
0. Trulson and R. A. Mathies, J. Chem. , 84, 2068 (1986). 3. 24. B. Li and A. B. Myers, J. Phys. , 94, 4051 (1990). 25. J. R. Nestor and E. R. Lippincott, J. , 1, 305 (1973). Raman Spectroscopyfor Chemical Analysis. Richard L. McCreery Copyright 02000 John Wiley & Sons, Inc. 1. 20) permit prediction of the overall Raman scattering, P R , and the specific intensity, L. These quantities are functions of the sample and laser power and may be varied within the limits discussed in Chapter 2. In order to produce an analytical signal, some fraction of the Raman scattered light must be collected and detected.
8. Some features and shortcomings of FTIR, NIR, and Raman spectroscopy. Italics indicate disadvantages. 5 to 25 pm. The resulting compatibility with fiber optics, common glass, and water was a major incentive for NIR development for chemical analysis. NIR spectra may be obtained noninvasively from samples inside glass containers or remotely down a fiber-optic cable. 5 pm range, the absorption is much weaker than in the FTIR region and is often used to quantify water content. However, NIR is based on overtones of FTIR fundamentals, and NIR absorptions are both weaker and broader than FTIR bands.
Since some magnification often occurs between the sample and the spectrometer, it is important to define AD as the area observed at the sample. As will be shown later, AD can vary greatly for different spectrometers, with a corresponding effect on signal size. In the end, the Raman signal is proportional to the sample area, which is both illuminated by the laser and observed by the collection optics. In Eq. 3) R D is the solid angle in steradians (sr) collected by the spectrometer and transmitted into the wavelength analyzer.