Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1982-11-01
1985-04-23
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3308
Patent
active
045132470
ABSTRACT:
For recording three-dimensional nuclear magnetic resonance spectra the nuclear spin-system must be excited by three 90.degree. pulses, with variation of the pulse intervals t.sub.1 and t.sub.m. Instead of varying the two pulse intervals separately, which would be required for recording the two time dimensions defined by t.sub.1 and t.sub.m, the mixing time t.sub.m is simultaneously varied proportionally to the evolution period each time the measurement is repeated with a varied evolution period t.sub.1, so that t.sub.m =.kappa.t.sub.1. K is so selected that the interesting mixing time period is completely covered by the predetermined number of measurements taken with different evolution times. The variation of t.sub.m is reflected by the shape of the resonance lines and can be determined also by reverse transformation of the individual resonance lines into the time domain. A spectrometer for carrying out this method may conveniently be adapted to permit setting of the pulse interval t.sub.1 and the proportionality factor K, to form therefrom automatically the second pulse interval t.sub.m.
REFERENCES:
patent: 4318043 (1982-03-01), Crooks
W. P. Aue et al., Two-Dimensional Spectroscopy Application to Nuclear Magnetic Resonance, Journal of Chemical Physics, vol. 64, 1976, No. 5, pp. 2229-2246.
S. Macura, Two-Dimensional Chemical Exchange and Cross-Relaxation Spectroscopy of Coupled Nuclear Spins, Journal of Magnetic Resonance, vol. 43, 1981, No. 2, pp. 259-281.
Spectrospin AG
Tokar Michael J.
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