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
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