The Raman spectroscopy is a method of material characterization in which the sample is analyzed with the aid of monochromatic light (in the form of a laser). The irradiation as well as vibrational or rotational changes of polarizable molecules cause a light scattering process (inelastic scattering), which yields characteristic spectra. The information obtained enables substance identification, quantifications and inferences of material characteristics such as crystallinity, crystal orientation, composition, strain, temperature, doping and relaxation.
The method is used for reaction analyses and in materials science. Matrices that are regularly analyzed include pharmaceuticals, semiconductors, and samples from geology and mineralogy.