Mean square torque from linear molecule-rare gas atom systems at intermediate pressures

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Abstract
From spectral moments of infrared vibration-rotation bands, the mean square torques are measured for CO2, N2O and C2D2 mixed with neon, argon and krypton and appear to be a linear function of the density up to 250 amagat. Above this density and up to 468 amagat, a departure from linearity is observed in the study of CO2-krypton mixtures. In the linear range, a semi-empirical intermolecular potential, proposed by Gordon, is used to interpret the results. This potential introduces an anisotropic parameter δ for the repulsive forces. It is shown that δ is dependent only on the active molecule. Moreover, it is concluded that the repulsive forces play a dominant part in the mean square torque.