Method for improving the resolution of solid-state NMR multiple-

Details Method for improving the resolution of solid-state NMR multiple- Method for improving the resolution of solid-state NMR multiple-

1992-03-31

1993-11-09

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

052606554

ABSTRACT:
In an NMR solid-state imaging experiment, second averaging is carried out during the experiment to reduce the effects of unwanted interactions that obscure the results of an interaction of interest. The second averaging is arranged so that the second averaging interaction and the interaction of interest are along the same axis, but are separated in time. The second averaging interaction is further designed to introduce a multiple of .pi./2 phase offset between applications of the interaction of interest. In this way, even when the sum of the actual resonance frequency and the second averaging frequency are zero, the spin dynamics are still modulated and a second averaging takes place.
An additional advantage is provided in that the resonance frequency can be sampled in such a fashion that the second averaging frequency does not appear in the observed resonance frequency.

REFERENCES:
patent: 4654593 (1987-03-01), Ackerman
patent: 4833411 (1989-05-01), McDonald et al.
"Time-Suspension Multiple-Pulse Sequences: Applications to Solid-State Imaging", D. G. Cory, J. B. Miller and A. N. Garroway Journal of Magnetic Resonance, vol. 90, pp. 205-213 (1990).
"Multiple-Pulse Methods of 1H N.M.R. Imaging of Solids: Second Averaging", D. G. Cory, J. B. Miller, R. Turner and A. N. Garroway, Molecular Physics, vol. 70, No. 2, pp. 331-345 (1990).

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