MODELING N$_2$ AND H$_2$ BROADENED CH$_4$ INFRARED ABSORPTION SPECTRA. LINE-MIXING MODEL AND COMPARISONS WITH MEASUREMENTS
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Date
2005
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Ohio State University
Abstract
Line-mixing effetcs have been studied in $\nu_3$ and $\nu_4$ bands of CH$_4$ perturbed by N$_2$ and H$_2$ at various temperatures. The absorption in the 1100-1500 and 2800-3200 cm$^{-1}$ spectral regions for total pressures in the 0.25-2 and 25-500 atm ranges have been measured. A line-mixing model is proposed wich is based on state-to-state collisional transfert rates calculated from intermolecular potential surface with a semiclassical approach. The line-coupling relaxation matrix is constructed from these state-to-state collisional transfert rates and some empirical parameters. The results of comparisons between measurements and spectra computed accounting for and neglecting line-mixing prove the satisfactory quality of the model. Calculations with the line-mixing model of atmospheric spectra are also made.
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Author Institution: LISA-Faculte des Sciences et Technologie, 94010 Creteil Cedex, France