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RAMAN SPECTROSCOPY - G.C.G.-11

RAMAN SPECTROSCOPYS cattering Mid-IR and NIRrequire absorption of radiation from a ground level to an excited state, requires matching of radiation from source with difference in energy states. RAMAN spectroscopyinvolves scattering of radiation (matching of radiation is not required). SampleI0(n)I(n)n0n0-RayleighSamplen0 nM-RamanIR Spectrography -AbsorptionRaman Spectrography -ScatteringLaserdetectorLaserdetectorRAM AN SCATTERING RAMAN SPECTROSCOPY is concerned with radiation scattering from a sample. Scattering occurs when an incident photon interacts with the electric dipole of a molecule.

• (1). Raman Spectroscopy can be used not only for gases but also for liquids & solids for which the infrared spectra are so diffuse as to be of little quantitative value. • (2). Raman Effect is exhibited not only by polar molecules but also by non-polar molecules such as O2, N2, Cl2 etc. • …

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