Small angle neutron scattering studies of dilute supercritical solutions. I. Pure supercritical neon

Small angle neutron scattering (SANS) results are presented for states of neon close to the critical isochore and supercritical temperatures between 47 and 60 K. The net intensities were converted to absolute units of differential cross section per unit sample volume by comparison with precalibrated secondary standards. The values of the differential cross section at zero scattering vector are in excellent agreement with values calculated from an equation of state. Evidence of three-body forces in these data are compared to that present in Krypton data reported earlier. It is concluded that small angle experiments of the sort reported here should be repeated for the heavier noble gases, for which effects from three-body forces are anticipated to be larger.