Raman analysis system is based on the detection of scattered light resulting from the vibrations and rotations of the sample molecules irradiated with monochromatic light. From the frequency differences from the primary light to the scattered light, a spectrum results which, similar to the IR spectra, allows conclusions to be drawn about the chemical composition of the material under investigation. The physical processes which underlie the two spectroscopic methods differ, but the individual bands can still be observed in almost the same places in the spectra. The IR and Raman spectra of a material complement each other in their information content.