Raman spectroscopy is one of the most versatile methods of molecular analysis. The Raman effect consists of the appearance of displaced lines in the spectrum of monochromatic light scattered by substances. The Raman scattered radiation is spectrally shifted by an amount which corresponds to the vibrational or rotational energy for a transition of the molecule in question. The magnitudes of these displacements provide an unambiguous identification ("fingerprint") of the measured species. The amount of light which is scattered at a given wavelength (intensity of the spectral line) is a measure of molecular concentration.