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Two-Dimensional Micro NIR FT Raman Spectroscopy

Optical micro methods have an enormous potential of supplying analytical information: For every volume element complete spectra may be recorded. Since these techniques are non-destructive repeated analyses may be made even from precious samples. Micro techniques applying the methods of vibrational spectroscopy may supply detailed information concerning the composition of a sample, the identity and the structure of its components. The resolvable volume element is determined by the resolving power of the microscope and by the minimal amount of sample defined by the limit of detection. For Raman microscopes this is in the order of 1 cubic micrometer, for infrared microscopes in the order of 1000 cubic micrometers. Microscopes, however have an optical conductance) inferior to that of modern spectrometers. A compromise has to be found between the utilizable Raman light flux and spatial resolution. Both cannot be maximal under the same conditions. FT IR microscopes as well as Raman microscopes with dispersive spectrometers are supplied by several companies. The recently developed NIR FT Raman spectroscopy2 has the advantage of being essentially immune against fluorescence of impurities or products of decomposition.