Temperature dependence of structure of liquid carbon tetrachloride measured by pulsed neutron total scattering
Temperature dependence of structure of liquid carbon tetrachloride measured by pulsed neutron total scattering
复制标题
脉冲中子全散射测量液态四氯化碳结构的温度依赖性
DOI：
10.1063/1.457541
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发表时间：
1989
影响因子：
4.4
通讯作者：
M. Misawa
中科院分区：
文献类型：
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作者：
M. Misawa
采用脉冲中子全散射技术，沿液汽共存曲线在-20、20、60、110和160℃下测量了液态四氯化碳（CCl4）的结构。随着温度的升高，观察到结构因子Sm(Q)的特征变化。实验结果表明，即使在本工作研究的最高温度160℃下，取向相关性仍然存在。观察到的 Sm(Q) 是根据有效不相关分子的堆积或数量密度以及最近邻居之间引入的首选方向来讨论的。随着温度的升高，Sm(Q)的第一个峰变宽并且向该峰的较低Q侧移动的实验事实仅归因于分子数密度的降低，而位于2.2 A−1附近的第二个小峰和该峰之后的谷的变宽归因于相关分子的数量减少和分布变宽。
The structure of liquid carbon tetrachloride (CCl4) has been measured at −20, 20, 60, 110, and 160 °C along the liquid–vapor coexisting curve by means of pulsed neutron total scattering technique. Characteristic changes of the structure factor Sm(Q) have been observed with increase of temperature. Experimental results show that orientational correlation still exists even at 160 °C, the highest temperature studied in this work. The observed Sm(Q)’s are discussed in terms of a packing or a number density of effectively uncorrelated molecules and preferred orientations introduced between the nearest neighbors. Experimental facts of broadening of the first peak of Sm(Q) and the shift toward the lower Q side of this peak with an increase of temperature are attributed simply to a decrease of molecular number density, while broadening both of a small second peak located around 2.2 A−1 and a valley following this peak is attributed to a decrease in number and broadening in distribution of correlated molecules.