Raman spectrometer

A Raman spectrometer is an instrument that utilizes the Raman effect to analyze materials. When light, typically from a laser, interacts with molecules in a sample, most of the light scatters with its original wavelength. However, a small portion of the light is scattered at different wavelengths, a phenomenon known as Raman scattering.123

This change in wavelength occurs because molecules can absorb energy from or give energy to the scattered photons. The specific shifts in wavelength are characteristic of the molecule's vibrational and rotational states, providing a unique "fingerprint" for identification. Raman spectroscopy is valuable because it can analyze samples in various states (solid, liquid, or gas) without requiring a vacuum, and it offers complementary information to other spectroscopic techniques.123