Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-01-12
1988-12-06
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G61R 3320
Patent
active
047898321
ABSTRACT:
A three-dimensional NMR spectroscopy capable of obtaining a plurality of two-dimensional NMR spectra by a single series of measurements. In this spectroscopy, a pulse sequence consisting of three 90.degree.-pulses and a 180.degree.-pulse is utilized. The three 90.degree.-pulses are produced at intervals. The interval between the second and the third 90.degree.-pulses is set to .tau..sub.m. The 180.degree.-pulse is produced at the middle of the interval .tau..sub.m. In a first embodiment of the invention, the interval t.sub.1 between the first and the second 90.degree.-pulses and the RF phases .phi. of the first and second 90.degree.-pulses and of the 180.degree.-pulse are taken as variables. The free induction decay signals produced after the lapse of a period of t.sub.2 subsequent to the third 90.degree.-pulse are collected to create data S (t.sub.1, t.sub.2, .phi.). In a second embodiment of the invention, the intervals t.sub.1 and .tau..sub.m are taken as variables, .tau..sub.m being rewritten as t.sub.3. The free induction decay signals produced during the period t.sub.2 are collected to create data S (t.sub.1, t.sub.2, t.sub.3). The data of either kind is subjected to complex Fourier transformation with respect to t.sub.1 and t.sub.2 and then to cosine Fourier transformation with respect to .phi. or t.sub.3 to obtain a three-dimensional NMR spectrum S (.omega..sub.1, .omega..sub.2, p) or S (.omega..sub.1, .omega..sub.2, J) made up of plural 2D NMR spectra.
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Jeol Ltd.
O'Shea Kevin D.
Tokar Michael J.
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