An application of Gordon’s M- and J-diffusion models to the calculation of the correlation functions of infrared perpendicular transitions in linear molecules

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Abstract
The M− and J−diffusion models, which are proposed by Gordon to describe the reorientation of molecules, and which were applied to parallel vibrations only, are extended to the particular case of the perpendicular vibration of a linear molecule. In the case of the M−diffusion model, the method presented here yields a simple analytical form for the correlation function of the perpendicular vibration. In the case of the J−diffusion model, the spectral intensity is also obtained in a simple analytical form. Previously published experimental data on compressed gases are compared with the theoretical results.