Multiple Quantum NMR Dynamics in Dipolar Ordered Spin Systems

TL;DR

This paper explores analytical and numerical methods to study multiple quantum NMR dynamics in dipolar ordered spin systems, revealing faster multi-spin correlations useful for understanding nuclear spin behavior in solids.

Contribution

It introduces two novel methods for MQ NMR analysis in dipolar ordered systems, enhancing the investigation of many-spin dynamics and correlations.

Findings

Faster creation of many-spin clusters and correlations.

Effective measurement of dipolar temperature in quasi-equilibrium.

Enhanced understanding of spin dynamics in solids.

Abstract

We investigate analytically and numerically the Multiple Quantum (MQ) NMR dynamics in systems of nuclear spins 1/2 coupled by the dipole-dipole interactions in the case of the dipolar ordered initial state. We suggest two different methods of MQ NMR. One of them is based on the measurement of the dipolar temperature in the quasi-equilibrium state which establishes after the time of order T2 after the MQ NMR experiment. The other method uses an additional resonance 45^0 -pulse after the preparation period of the standard MQ NMR experiment in solids. Many-spin clusters and correlations are created faster in such experiments than in the usual MQ NMR experiments and can be used for the investigation of many-spin dynamics of nuclear spins in solids.