The structure of fluid trifluoromethane and methylfluoride
The structure of fluid trifluoromethane and methylfluoride
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流体三氟甲烷和甲基氟化物的结构
DOI：
10.1088/0953-8984/12/41/302
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
W. Schroer
中科院分区：
文献类型：
--
作者：
J. Neuefeind;H. Fischer;W. Schroer
我们给出了在超临界条件下对极性氟碳化合物HCF_3和H_3CF的硬X射线和中子衍射测量，测量范围约为分子密度的10倍。用Levesque-Weiss-Reatto反转方案推导了测量的部分对分布函数背后的位-位势。相邻的氟碳分子之间的取向相关性--具有相当大的偶极矩，但没有形成氢键的倾向--与液体氯化氢这样的高极性体系相比很小。事实上，在HCF_3和H_3CF中的取向关联几乎和CF4流体一样小，CF4是一种没有偶极矩的碳氟化合物。
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.