The structure of fluid trifluoromethane and methylfluoride
J Neuefeind; H E Fischer; W Schröer
Журнал:
Journal of Physics: Condensed Matter
Дата:
2000-10-16
Аннотация:
We present hard x-ray and neutron diffraction measurements on the polar fluorocarbons HCF<sub>3</sub> and H<sub>3</sub>CF 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 HCF<sub>3</sub> and H<sub>3</sub>CF are found to be nearly as small as those of fluid CF<sub>4</sub>, a fluorocarbon with no dipole moment.
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