Article | REF: P2865 V1

Raman spectrometry

Authors: Jacques BARBILLAT, Daniel BOUGEARD, Guy BUNTINX, Michel DELHAYE, Paul DHAMELINCOURT, François FILLAUX

Publication date: September 10, 1999

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1. Theoretical background and principles

Raman scattering spectrometry, like infrared absorption, is a technique for observing the vibrational states (and rotational states in the case of gases) of a molecule. We'll start by reviewing a few notions of vibrational molecular dynamics, before looking at how electromagnetic radiation can interact with matter, in order to provide quantitative information on the nature of these dynamics (frequency, vibration symmetry, etc.).

1.1 Molecular energy levels

If we neglect ensemble translations, of very low energy, the state of any molecule can be described from the rotational Ψ rot , vibrational Ψ vib and electronic Ψ el wave...

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Theoretical background and principles