Method for recording nuclear magnetic resonance spectra

Details Method for recording nuclear magnetic resonance spectra Method for recording nuclear magnetic resonance spectra

1986-12-04

1988-09-27

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, G01R 3320

Patent

active

047744677

ABSTRACT:
To eliminate homonuclear couplings along the .omega..sub.1 axis in 2D spectroscopy, a time reversal pulse (5, 6) is inserted into the pulse sequence that is generally employed for experiments of this type, which time reversal pulse divides the evolution period t.sub.1 that is required for experiments of this type into two equal portions. The time reversal pulse is intended to cause the spin moments to rotate about an angle .beta..sub.n and is preferably composed of two 90.degree. pulses, the first of which has a phase of .beta..sub.n +.phi..sub.q and the second a phase of .pi.+.phi..sub.q. The phase of the RF oscillation of the pulse that precedes the time reversal must be shifted by an angle of .beta..sub.n. A plurality of 3(2N-1) of these signals having different phases are added together after being weighted by a factor which preferably amounts to ##EQU1##

REFERENCES:
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patent: 4345207 (1982-08-01), Bertrand et al.
patent: 4510449 (1985-04-01), Ernst et al.
patent: 4521732 (1985-06-01), Pegg et al.
Bax and Freeman, J.Magn.Reson., 1981, 44, 542.
Griesinger, Sorensen and Ernst, J.Am.Chem.Soc., 1985, 107, 6394-6396.
ETH Dissertation No. 7658, Sorensen, Modern Pulse Techniques in Liquid State Nuclear Magnetic Resonance Spectroscopy, 1984.

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