Abstract
An analysis of the orientation correlation between the neighbouring molecules of nitrogen and oxygen is given. The correlated form factor f2(Q) is formed giving proper weighting to the parallel and perpendicular orientations and taking into account that fact that the centre structure factor in the region of the first peak should be well produced by a hard-sphere potential. These orientation correlations give about 62% and 64% parallel orientations in nitrogen and oxygen respectively using the proper choice of hard-sphere diameters and bond lengths from the measurements of Furumoto and Shaw. The very good agreement between experimental values of Sm(Q) and those calculated on the basis of this simple model shows that the independent-atom approximation is valid even for linear molecules like nitrogen and oxygen.
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