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• W2019976283 abstract "Temperature (200–300K) and pressure (70–200atm) dependent laboratory measurements of infrared transmission by CO2–N2 mixtures have been made. From these experiments the absorption coefficient is reconstructed, over a range of several orders of magnitude, between 600 and 1000cm−1. The elevated densities used in the experiments (up to 200atm) magnify the contribution of the wings of the ν2 band lines. In order to analyze the spectra, a theoretical model based on the energy corrected sudden approximation is proposed which accounts for line-mixing effects within the impact approximation. This approach uses the model and associated parameters built previously to model Q branches (JQSRT 1999;61:153) but extends it by now including all P, Q, and R lines. No adjustable parameters are used and fundamental properties of the collisional relaxation operator are verified by using a renormalization procedure. Comparisons between measured and calculated spectra confirm that neglecting line-mixing (Lorentzian model) leads to an overestimation of absorption by up to three orders of magnitude in the far wings. On the other hand, the proposed approach leads to satisfactory results both in regions dominated by contributions of local lines and in the wing: measured spectra are correctly modeled over a range where absorption varies by more than four orders of magnitude. The largest discrepancies, which appear about 150cm−1 from the ν2 center, can be due to finite duration of collisions effects or to uncertainties in the experimental determination of very weak absorption." @default.
• W2019976283 created "2016-06-24" @default.
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• W2019976283 date "2004-11-01" @default.
• W2019976283 modified "2023-10-16" @default.
• W2019976283 title "Spectra calculations in central and wing regions of CO2 IR bands between 10 and . I: model and laboratory measurements" @default.
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• W2019976283 doi "https://doi.org/10.1016/j.jqsrt.2004.04.003" @default.
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