64 research outputs found
Spin counting experiments in the dipolar-ordered state
Spin counting experiments were performed in the dipolar-ordered state. The transient dynamics of the spin system was also studied using multiple quantum nuclear magnetic resonance techniques. The dipolar-ordered state can be prepared from a state of Zeeman equilibrium at high field by adiabatically removing the Zeeman field.open161
Multiple Quantum NMR Dynamics in Dipolar Ordered Spin Systems
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.Comment: 11 pages, 3 figures. accepted for publication in Physical Review
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