Abstract
A new formulation of the theory of overlapping line broadening of isotropic Raman scattering is presented in the framework of the impact approximation. This formulation takes into account close or “strong” collisions in the exponential (sudden) approximation. The projection operator formalism is employed to consider both the weak line overlap (resolved isotropic Raman Q-band) and the pressure narrowing limit (unresolved Q-band). The quantum model of j-diffusion is assumed to lead to the matrix factorization of the impact operator. The factorization opens the way for determining all matrix elements of the impact operator using a set of experimental line widths and shifts of the isotropic Raman Q-band. The resulting possibility to determine the rotational energy relaxation time by measuring the line widths of the Q-band spectrum is discussed.
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