Structure of liquid carbon tetrachloride up to the subcritical point measured by wide Q-range neutron diffraction

Abstract

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Thermodynamic state dependence of orientational order and rotational relaxation in carbon tetrachloride

“…Within the gas phase ͑at the same temperature͒ the second peak is barely noticeable, with the function decaying to its equilibrium value at Ϸ16 Å. Both estimations of the range are in excellent agreement with those obtained from exponential fits to neutron scattering results, 41 which yield a correlation length of 10-13 Å for the liquid and 13-17 Å for the saturated vapor ͑both at 548 K͒.…”

“…2͒. All of these features are in excellent agreement with those highlighted in the analysis of neutron scattering experiments, 28,41 providing additional confidence in the forthcoming analysis of orientational correlations.…”

“…Given that in the works described above 36,37 it has been shown that orientational order is stronger than usually assumed, it is interesting to ask to which extent temperature dampens the order found for the liquid, and whether there is any sort of orientational correlation in the gas phase, as no signs thereof could be inferred from experiment. 28,41 Two additional lower density gas-phase points have been included in this study, compared to Ref. 41, for the reasons stated below.…”

“…28,41 Two additional lower density gas-phase points have been included in this study, compared to Ref. 41, for the reasons stated below.…”

“…8,23,28,[39][40][41] The study encompasses all the phases that might be roughly described as orientationally disordered, i.e., plastic crystal, liquid, and gas phases. To this end the calculations for the ambient temperature liquid 36 and the plastic crystal 37 have been augmented with sample state points along the coexistence line, covering the same temperature and density ranges as in the neutron scattering experiments of Refs.…”