Abstract
Recent NMR experiments have measured the conversion rate of hydrogen molecules dissolved in paramagnetic organic solvents. The registered proton signals display negative peaks during an initial period. The present interpretation describes a polarization effect: the transient behavior of the nuclear spins directed on the average along the magnetic electronic spins. It relies on a nonequilibrium ortho drift and gives access to numerous parameter functions of the sample magnetic concentration. The most important ones are related to the negative transient nuclear magnetization: its building, maximum, and lifetime. Important ratios are deduced: conversion versus relaxation characteristic times and collision versus sticking time intervals. The contact interaction is found to be stronger than the long-range and fluctuating dipolar one for magnetically concentrated samples during the short sticking of the colliding partners but weaker for diluted ones. Some information on the viscosity of the organic solvent is d...
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