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- W2028591126 abstract "Infrared spectra of the CO first overtone absorption band have been studied at room temperature for pressures up to 104.5 bar. The integrated intensities are found to be proportional to the gas density. The dipole moment autocorrelation function is used to assess a collisional model derived from the impact approximation and the Gordon M- and J-diffusion models developed classically, as well as the semi-classical M-diffusion model. The semi-classical M-model, which is better than the classical models, reproduces the experimental correlation functions well only for densities up to about 40 Am. From an analysis of the individual lines at low pressures, we conclude that their profiles are the product of a Lorentz function and of an empirical exponential function. The normalized band contours are calculated by summing the pressure-broadened rotational lines, assuming for these lines successively a Lorentz shape and two modified Lorentz shapes derived from the low-pressure line analysis. In the first case, a discrepancy between theoretical and experimental bandshapes become noticeable from about 20 Am and increases with density. The results are greatly improved by using two other models, one of which gives reasonable agreement with the experiments at all pressures. At high pressures, interference effects between the strongly overlapping lines are probably not negligible." @default.
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- W2028591126 date "1981-07-01" @default.
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- W2028591126 title "Intensity, bandshapes and dipole correlation functions for the first overtone of compressed CO" @default.
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- W2028591126 doi "https://doi.org/10.1016/0022-4073(81)90021-2" @default.
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