Demagnetization field effects in two-dimensional solution NMR

Abstract

Anomolous cross-peaks in two-dimensional spectra are sometimes observed for samples that have a high density of magnetic nuclear spins. Two interpretations of these effects have been given in the literature: There is a classical interpretation involving Larmor frequency shifts generated by the nuclear demagnetizing field, and there is a macroscopic quantum interpretation invoking long-range multiple-quantum coherences. The article contrasts the two, with emphasis placed on the classical description. © 1996 John Wiley & Sons, Inc.