Abstract
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 liquidCCl4 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.
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