Theory of infrared and Raman spectra of diluted van der Waals solutions: Simple product approximation and its extension

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Abstract
The theory of infrared and anisotropic Raman spectra of diatomic molecules dissolved in inert solvents is reexamined without any ad hoc factorization of rotational-vibrational correlation functions. The total correlation function is expanded into a series. Its leading term represents the simple product approximation and its higher-order terms the successive corrections. An order-of-magnitude estimation of corrective terms is presented. They prove to be small, in weakly interacting van der Waals solutions at least, and their spectral effects by no means conspicuous.