Many-body interaction effects on the low-k structure of liquid Kr.
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.
Guarini
E
E
Istituto Nazionale per la Fisica della Materia, Unità di Ricerca di Genova, via Dodecaneso 33, I-16146 Genova, Italy.
Magli
R
R
Tau
M
M
Barocchi
F
F
Casanova
G
G
Reatto
L
L
D007726:Krypton / Q000737:chemistry*; D008962:Models, Theoretical; D033363:Neutron Diffraction; D055585:Physical Phenomena; D010825:Physics; D013816:Thermodynamics
D007726:Krypton