Neutron diffraction measurements and theoretical calculations of the structure factor S(k) of liquid Kr are extended to small k values (k<4 nm^-1). The results show that many-body interaction contributions have an increasing effect on S(k) as k->0, reaching at least 40% of the measured intensity. Both the phase diagram and the low-k structural data of dense Kr turn out to be closely reproduced by the hierarchical reference theory if additional many-body forces are taken into account by an augmented strength of the Axilrod-Teller triple-dipole potential. The experimental density derivative of S(k) is also used for a very sensitive test of the theories and interaction models considered here.
Many-body interaction effects on the low-k structure of liquid Kr / E. Guarini, R. Magli, M. Tau, F. Barocchi, G. Casanova, L. Reatto. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 63:5, Part 1 (Article Num. 052201)(2001 Apr 11), pp. 522011-522014.
Many-body interaction effects on the low-k structure of liquid Kr
R. MagliSecondo
;L. Reatto
2001
Abstract
Neutron diffraction measurements and theoretical calculations of the structure factor S(k) of liquid Kr are extended to small k values (k<4 nm^-1). The results show that many-body interaction contributions have an increasing effect on S(k) as k->0, reaching at least 40% of the measured intensity. Both the phase diagram and the low-k structural data of dense Kr turn out to be closely reproduced by the hierarchical reference theory if additional many-body forces are taken into account by an augmented strength of the Axilrod-Teller triple-dipole potential. The experimental density derivative of S(k) is also used for a very sensitive test of the theories and interaction models considered here.Pubblicazioni consigliate
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