Line shapes of multiple quantum NMR coherences in one-dimensional quantum spin chains in solids

摘要

General formulae for intensities of multiple quantum (MQ) NMR coherences in systems of nuclear spins coupled by the dipole-dipole interactions are derived. The second moments of the MQ coherences of zero- and second orders are calculated for infinite linear chains in the approximation of the nearest neighbor interactions. Supercomputer simulations of intensities of MQ coherences of linear chains are performed at different times of preparation and evolution periods of MQ NMR experiments. The second moments obtained from the developed theory are compared with the results of the supercomputer analysis of MQ MMR dynamics. The linewidth information in MQ MMR experiments is discussed. (C) 2004 Elsevier Inc. All rights reserved.