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Neutron-diffraction data on liquid iodine at three temperatures on the coexistence curve are presented. The data show that the strong orientational correlations between neighboring molecules, already found at the melting point, persist up to the vicinity of the critical point. The A2 effective pair potential model is found to describe satisfactorily the structure of the liquid along the entire coexistence curve.

Accurate neutron-diffraction measurements on saturated liquid iodine, up to Q=16 Å −1, at T=409 K are presented. The intermolecular structure factor has been derived and a study performed on the presence of orientational correlations and their contribution to the intensity distribution. The experimental intermolecular pair correlation function has been compared with the results of a simulation performed using the anisotropic atom-atom pair potential proposed by Rodger, Stone, and Tildesley [Mol. Phys. 63, 173 (1988)], giving excellent agreement. A comparison with previous neutron and x-ray data is also discussed.