The structure of fluid trifluoromethane and methylfluoride

Details The structure of fluid trifluoromethane and methylfluoride The structure of fluid trifluoromethane and methylfluoride

2000-06-09

arxiv.org/abs/cond-mat/0006157v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 9 figures

Scientific paper

10.1088/0953-8984/12/41/302

We present hard X-ray and neutron diffraction measurements on the polar fluorocarbons HCF3 and H3CF under supercritical conditions and for a range of molecular densities spanning about a factor of ten. The Levesque-Weiss-Reatto inversion scheme has been used to deduce the site-site potentials underlying the measured partial pair distribution functions. The orientational correlations between adjacent fluorocarbon molecules -- which are characterized by quite large dipole moments but no tendency to form hydrogen bonds -- are small compared to a highly polar system like fluid hydrogen chloride. In fact, the orientational correlations in HCF3 and H3CF are found to be nearly as small as those of fluid CF4, a fluorocarbon with no dipole moment.

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