Abstract
An experimental and theoretical study of the quadrupolar relaxation of xenon-131 by quadrupolar solvents has been performed. The electric-field-gradient (EFG) fluctuations at the xenon nucleus are considered to be of purely electrostatic origin and are calculated by means of a new theoretical model called PISA (pair interactions structureless approximation), which is based on a simplified description of the structure of molecular liquids. The PISA results are compared to those of a Monte Carlo simulation. The influence of self- and cross-correlation functions on the total EFG correlation function is discussed. Calculated EFG fluctuations are then used, together with experimental relaxation rates, to determine effective correlation times. These correlation times are analyzed by considering different solvent motions.
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