SCATTERING OF LIGHT FROM ATOMS, MOLECULES AND FREE ELECTRONS, IN GASES AND PLASMAS.
MICHIGAN UNIV ANN ARBOR DEPT OF NUCLEAR ENGINEERING
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In this dissertation some basic relationships concerning the scattering of light from particles which are very small compared to wavelengths of interest--specifically free electrons, ions, atoms and simple molecules--are examined from a consistent application of quantum perturbation theory to a many body system. Of major concern are particles in gaseous or plasma systems, although many of the results may have broader validity. For the most part attention is confined to nonresonance, linear, single scattering. Higher ordered corrections to the scattering cross section which arise from the variation of the refractive index from unity are neglected and the possible effects of variations in the intensity of incident radiation over distances comparable to wavelengths of interest are not considered in detail. The results obtained under these conditions appear to retain wide limits of applicability are discussed. However, where necessary, all of these conditions can be relaxed to varying degrees through procedures which are mentioned. Among the major results obtained are, first, a consistent and informative derivation of the dependence of light scattering in gases on particle-particle interactions second, a comparatively simple derivation of the angular distribution of the scattered light third, detailed relationships between scattering cross sections and oscillator strengths which permit the calculation of Rayleigh and Raman scattering cross sections under appropriate conditions and fourth, a relationship between familiar quantum expressions for scattering cross sections and refractive indices. Author