CORRECTING THE CLASSICAL DIPOLAR DEMAGNETIZING FIELD IN SOLUTION NMR

Numerous observations of anomalous intermolecular multiple-quantum and cross correlation peaks in solution NMR have led to a variety of theo retical treatments, some involving radiation damping or modified class ical Bloch equations, others involving full quantum mechanical derivat ions. We explore the theoretical underpinnings of the classical model, which invokes the dipolar demagnetizing field, and correct a signific ant omission in the original formulation which has been propagated in later papers. This correction gives good agreement between theory and experiment.