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Abstract
Neutron diffraction experiments have been performed at 220 K on liquid carbon dioxide (CO2), deuterated ethylene (C2D4), deuterated ethane (C2D6) and the equimolar liquid mixtures 0·5 CO2 + 0·5 C2D4 and 0·5 CO2 + 0·5 C2D6 in order to investigate the effect of quadrupole forces on the structure of the mixtures. Comparison of the structure of the mixtures with the mean of those of their pure components reveals structural features which are present only in the mixtures. Analogous to thermodynamic excess functions, excess intermolecular structure functions, i E m,0·5CO2+0·5C2D4 (Q) and i E m,0·5CO2+0·5C2D6 (Q) and excess intermolecular pair correlation functions, G E m,0·5CO2+0·5C2D4 (r) and G E m,0·5CO2+0·5C2D6 (r) have been obtained. The differences in the corresponding excess functions for the two liquid mixtures are discussed in terms of the nature and extent of the quadrupole coupling between the constituent unlike molecules. It is concluded that electrostatic quadrupole interactions play a significant role in determining the local structure of the two liquid mixtures.