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

Structure of liquid and gaseous $CCl4$ at elevated temperatures from 195 °C to the subcritical point 275 °C (⁠$Tc$=285.15 °C) along the liquid–vapor coexistence curve have been studied by means of pulsed neutron diffraction. Structure factor in a wide range of momentum transfer $Q$ from 0.03 to 20 $Å−1$⁠, covering from the small angle scattering region to atomic-scale structure region, has been obtained. Long-range density fluctuation and atomic scale structure have been analyzed: (1) molecular orientational correlation still exists in liquid$CCl4$ at 275 °C while it disappears in its saturated vapor; (2) correlation lengths of density fluctuation are 10–13 Å for the liquid at 275 °C and 13–17 Å for its saturated vapor; and (3) molecular-density fluctuation $(〈Nm2〉−〈Nm〉2)/〈Nm〉$ is estimated to be 2.4 for the liquid at 275 °C and 9.3 for its saturated vapor.