The Backscattering Geometry for Raman Spectroscopy of Colored Materials

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Abstract
Quantitative laser Raman spectroscopy on colored substances is considered, and it is shown that sample positioning and concentration are less critical when 180° illumination is used in place of the more common 90° illumination. In addition, the correction of Raman intensities for sample absorption is easily accomplished for data collected via backscattering (180° geometry), and the appropriate equations are presented. A spinning sample cell and holder are described for 180° illumination. The design utilizes simple and inexpensive sample tubes which are conveniently employed with standard liquids and solids as well as volatile, air-sensitive, and corrosive compounds. Provision for sample heating and cooling is described.