Raman spectroscopy collision-induced light scattering

Collision-induced light scattering is the name for the Raman spectroscopy that arises from the interaction-induced variations of the polarizability of a sample. For a description of the scope of CILS, we consider briefly two somewhat extreme cases, a tenuous gas and a liquid. 

G. C. Tabisz, W. R. Wall, D. P. Shelton, and J. Ho. The Spectral Profile of Collision Induced Light Scattering from some Molecular Liquids. In Advances in Raman Spectroscopy, Heyden Son, London, 1972, pp. 466-471. 

CILS spectroscopy is concerned with the frequency, density, polarization, and temperature dependences of supermolecular light scattering. Pure and mixed gases are considered, that is, complexes of like and of dissimilar molecules are of interest. In Section 1.3, we consider ordinary collision-induced Raman scattering nonlinear and electronic collision-induced Raman processes are the subject of the Appendix CILS of liquid and solid samples are considered in Part II, together with molecular dynamics simulations. 

In this contribution we present two laser spectroscopic methods that use coherent resonance Raman scattering to detect rf-or laser -induced Hertzian coherence phenomena in the gas phase these novel coherent double resonance techniques for optical heterodyne detection of sublevel coherence clearly extend the above mentioned previous methods using incoherent light sources. In the case of Doppler broadened optical transitions new signal features appear as a result of velocity-selective optical excitation caused by the narrow-bandwidth laser. We especially analyze the potential and the limitations of the new detection schemes for the study of collision effects in double resonance spectroscopy. In particular, the effect of collisional velocity changes on the Hertzian resonances will be investigated. 

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