4 Measurement of this calcite band on a test dispersive instrument enables an estimation of the spectrometer resolution. A calibration curve of the full width at half height (FWHH) for the 1085-cm -1 band of calcite as a function of spectral resolution has been reported for this purpose. Therefore, data obtained of a narrow Raman band on a FT-Raman system can be used to determine the resolution of a dispersive Raman system. The spectral bandwidth of Fourier-Transform (FT)-Raman systems is continuously variable by altering the optical path difference of the interferometer and furthermore is capable of obtaining much lower spectral bandwidth than most practical dispersive systems. Field portable systems typically operate with fixed slits and gratings and thus operate with a fixed spectral bandwidth, while in many laboratory systems the slit widths and gratings are variable. These standards are used around the world to improve product quality, enhance health and safety, strengthen market access and trade, and build consumer confidence. 4.6 The spectral bandwidth of dispersive Raman spectrometers is determined primarily by the focal length of the spectrometer, the dispersion of the grating, and the slit width. The American Society for Testing and Materials (ASTM) is a globally recognized leader in the development and delivery of voluntary consensus standards.
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