Temperature dependence of structure of liquid carbon tetrachloride measured by pulsed neutron total scattering

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Abstract
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.