What is Raman spectroscopy?

Raman spectroscopy is a spectroscopic technique used to observe vibrational, rotational, and other low-frequency modes in a system. It relies on inelastic scattering of monochromatic light, usually from a laser in the visible, near infrared, or near ultraviolet range. The laser light interacts with molecular vibrations, phonons or other excitations in the system, resulting in a shift in the energy of the laser photons. This shift provides information about the vibrational modes in the sample and is used for identification and analysis of materials, as well as studying chemical structures and properties.