Line Shape - Lifetime Relationship and Emission and Scattering of Light by Polyatomic Molecules'
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A unified theory of ordinary Rayleigh scattering, Raman scattering, and the absorption and reemission of light is presented and discussed from an experimental spectroscopist's point of view. Application to polyatomic molecules presents unique problems which are discussed. The theory should be able to account for experimental results off, near, and on resonance, using weak exciting light sources of various band shapes. The evolution of the Franck–Condon envelope on nearing the resonance region is described, and time dependent aspects of the interaction are treated in a general way. The theory in its present form cannot be used when the light source is so intense that population inversion, multiphoton effects, and stimulated processes take place.
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