The theory of the low-temperature chromato- graphic separation of the hydrogen isotopes
The theory of the low-temperature chromato- graphic separation of the hydrogen isotopes
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氢同位素低温色谱分离理论
DOI：
10.1063/1.1726782
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发表时间：
1965
期刊：
影响因子：
--
通讯作者：
J. King
中科院分区：
文献类型：
--
作者：
S. Benson;J. King
本文提出了一个新的静电理论，定量地解释了低温下氢同位素在氧化铝柱上的色谱分离。该理论基于氧化铝的表面电场与可极化氢同位素的相互作用。通过对Al_2O_3表面电场的计算，发现在77.4°K时存在两个活性吸附位，一个在Al_2O_3结构中的空位上，另一个在Al ~（3+）上.在任一站点上的总相互作用势是被吸附分子的极化率和分子距表面的距离的函数。在空位位置上的5-9电势给出与实验值有利地一致的结果。旋转的障碍，必要的解释的邻位和帕拉物种的分离，示出所产生的氢分子的分子极化率的平行和垂直分量的差异。
A new electrostatic theory is presented which quantitatively explains the chromatographic separation of the hydrogen isotopes on an alumina column at low temperatures. The theory is based on the interaction of the surface electric fields of the alumina with the polarizable hydrogen isotopes. By calculating the electric fields over an adopted Al2O3 surface, it is found that there are two active adsorption sites at 77.4°K, one over a vacancy in the Al2O3 structure, and the other over an Al3+. The total interaction potential over either site is a function of the polarizabilities of the adsorbed molecules and the distance the molecules are from the surface. A 5–9 potential over a vacancy site gives results which favorably agree with experimental values. The rotational barrier, necessary to explain the separation of the ortho and para species, is shown to arise from the difference in the parallel and perpendicular components of the molecular polarizability of the hydrogen molecule.