Collision induced fundamental band of N2and N2-Ar mixtures

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Abstract
The roto-vibrational absorption band of N2 and N2-Ar mixtures at low density have been measured and the induced spectrum of the N2-Ar pairs has been obtained. The detailed analysis of this spectrum shows that the isotropic overlap contribution is negligible, while the quadrupolar one accounts for 80 per cent of the total intensity; the remaining 20 per cent of the intensity is attributed to anisotropic induction mechanisms with a shorter range than the quadrupolar one. In order to fit the experimental line-shape it has been necessary to take the dependence of the quadrupole transition moment on the rotational quantum numbers in account.