Workshop on Investigations of Higher Order Correlation Functions
J. Phys. Colloques 46 (1985) C9-135-C9-139
DOI: 10.1051/jphyscol:1985917
TWO PARTICLE VERSUS THREE PARTICLE CONTRIBUTIONS TO A DYNAMICAL CORRELATION FUNCTION IN LIQUIDS
R. Brinkmann1, 2, M. Elwenspoek1, 3, P. Maxim1, C.A. Paulick1 et D. Quitmann11 Institut für Atom - und Festkörperphysik, Freie Universität Berlin, Arnimallee 14, D-1000 Berlin 33, F.R.G.
2 DESY, Hamburg
3 Katolieke Universiteit, Nijmegen
Abstract
That part of nuclear spin relaxation rate in a liquid which is caused by electric interaction with neighbour particles, RQ, is determined by the sum of a two particle and a three particle correlation function. In order to explain the weak temperature dependence generally found in pure liquid metals, we present and discuss a simple model description for the time development of the first neighbour shell. Two- and three-particle terms cancel in liquid metals for intermediate and long times, leading to a short correlation time. This is in agreement with the general trend of RQ data and with recent thorough theoretical treatments of a particular case.