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Moreau, G., J. Boissoles, R. Le Doucen, C. Boulet, R.H. Tipping, and Q. Ma, 2001: Experimental and theoretical study of the collision-induced fundamental absorption spectra of N2-O2 and O2-N2 pairs. J. Quant. Spectrosc. Radiat. Transfer, 69, 245-256, doi:10.1016/S0022-4073(00)00082-0.
New experimental and theoretical studies of the collision-induced fundamental absorption spectra of N2-O2 and O2-N2 pairs, where the first molecule makes the vibrational transition, are presented for a range of temperatures. Most of the absorption arises from the long-range quadrupolar and hexadecapolar mechanisms for which accurate matrix elements are available from other experimental measurements or from ab initio calculations. As in previous studies for N2-N2 and O2-O2, we vary the molecular matrix elements and the coefficients of the short-range induced dipole moments within realistic limits to obtain the best global fit to the temperature-dependent integrated intensities for all the experimental data. This procedure provides a more stringent test of the theory than the previous studies in which the parameters for N2 and O2 were optimized independently. Using the parameters thus determined, we then calculate the spectral profiles assuming the line shapes calculated quantum mechanically for N2. The agreement between theoretical and experimental profiles is good, but discrepancies in the plateau region of the S-branch, which we attribute to metastable dimer effects, and in the wings of the bands, which we attribute to the neglect of line mixing and higher-order induction mechanisms, still remain.
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