Small angle neutron scattering (SANS) in low density Kr-86 gas has been performed in order to measure the small-k behavior of the static structure factor S(k). Three number densities between 1.52 and 2.42 nm(-3) along the T = 297 K isotherm have been studied. The small-k dependence of the Fourier transform c(k) of the direct correlation function c(r) has been derived. The experimental determination of the k(3) term in the behavior of c(k) has led to a direct measurement of the London dispersion interaction in the pair potential of krypton. Also the contribution of the three-body potential in the asymptotic behavior of c(r) has been observed and related to the magnitude of the three-body interaction potential.
Long range potential effects in low density krypton gas / F. Formisano, C. Benmore, U. Bafile, F. Barocchi, P. Egelstaff, R. Magli, P. Verkerk. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 79:2(1997), pp. 221-224.
Long range potential effects in low density krypton gas
R. MagliPenultimo
;
1997
Abstract
Small angle neutron scattering (SANS) in low density Kr-86 gas has been performed in order to measure the small-k behavior of the static structure factor S(k). Three number densities between 1.52 and 2.42 nm(-3) along the T = 297 K isotherm have been studied. The small-k dependence of the Fourier transform c(k) of the direct correlation function c(r) has been derived. The experimental determination of the k(3) term in the behavior of c(k) has led to a direct measurement of the London dispersion interaction in the pair potential of krypton. Also the contribution of the three-body potential in the asymptotic behavior of c(r) has been observed and related to the magnitude of the three-body interaction potential.File | Dimensione | Formato | |
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