NMR Spectroscopy

Details NMR Spectroscopy NMR Spectroscopy

1982-08-16

1984-09-04

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3308

Patent

active

044700148

ABSTRACT:
In a method of heteronuclear decoupling in high resolution pulsed NMR spectroscopy, during acquisition of signals emanating from a nuclear species to be observed (e.g. carbon-13), irradiation of an interfering nuclear species (e.g. protons) is effected by means of a train of composite pulses, each of which approximately inverts the longitudinal magnetization. The pulses are of two types respectively having opposite r.f. phases, and the train constitutes a repeated sequence which consists of 2.sup.N+1 pulses of each type (where N is a positive integer) and which has a form chosen in accordance with specific rules to ensure effective decoupling.

REFERENCES:
U. Haeberlen and J. S. Waugh, Coherent Averaging Effects in Magnetic Resonance, Physical Review, vol. 175, No. 2, Nov. 10, 1968, pp. 453-467.
J. B. Grutzner and R. E. Santini, Coherent Broad-Band Decoupling-an Alternative to Proton Noise Decoupling in Carbon-13 Nuclear Magnetic Resonance Spectroscopy, Journal of Magnetic Resonance, vol. 19, pp. 173-187 (1975).
R. Freeman, S. P. Kempsell, and M. H. Levitt, Radiofrequency Pulse Sequences which Compensate their Own Imperfections, Journal of Magnetic Resonance, vol. 38, pp. 453-479 (1980).
M. H. Levitt, R. Freeman, Composite Pulse Decoupling, Journal of Magnetic Resonance, vol. 43, pp. 502-507 (1981).
M. H. Levitt, R. Freeman, T. Frenkiel, Broadband Heteronuclear Decoupling (Communications), Journal of Magnetic Resonance, vol. 47, pp. 328-330 (1982).

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