Abstract
The parameters describing electron—proton double-resonance phenomena in xylene solutions of fresh, washed asphaltene have been determined. The EPR line is found to be much more inhomogeneous than for air-blown asphalt. The values of T1e, T2e, and proton signal enhancement indicate that the particles of fresh asphaltene tumble faster than particles of air-blown asphalt. The surface electron—proton correlation frequency is found to be 30 Mc at 90°C.
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