US 4,068,161 A · Gyromagnetic resonance spectroscopy employing spin echo spin-spin decoupling and two-dimensional spreading

Abstract

A method of gyromagnetic resonance spectroscopy is disclosed which simplifies the resultant spectra by eliminating spin-spin coupling effects. The method is particularly useful for eliminating homonuclear spin-spin coupling effects. In the method, spin echo resonance of the resonators is obtained and the time elapsing between tipping of the resonators and detection of the resultant echo t.sub.1 is changed from one measurement to the next. The resultant echos are measured at equal intervals of time t.sub.2. Echo resonance data is Fourier transformed from the time domain into the frequency domain to obtain spectral data in the frequency domain as a function of t.sub.1. A second Fourier transform of the resonance data is then effected to transform the spectral data into data which is a function of both .omega..sub.1 and .omega..sub.2 where .omega..sub.1 and .omega..sub.2 are each related to 1/t.sub.1 and 1/t.sub.2, respectively. The spectral data in the .omega..sub.1 -.omega..sub.2 plane is then projected at 45.degree. to the .omega..sub.2 and .omega..sub.1 axes to derive spectral data free of spin-spin coupling effects. The data may also be projected perpendicular to and onto the .omega..sub.1 axis to obtain a J coupling spectrum.

Claims14

Dependent claims

In a method of gyromagnetic resonance spectroscopy, operative upon an assembly of first and second groups of gyromagnetic resonators immersed in a polarizing magnetic field wherein the magnetization vectors of said gyromagnetic resonators precess about said polarizing magnetic field, said first and second groups being coupled through spin-spin interaction, said spin-spin interaction causing a defocusing effect whereby the phase coherence of precession among said resonators is progressively lost, the steps of:

periodically tipping the magnetization vectors of said spin-spin coupled first and second groups of gyromagnetic resonators with respect to said polarizing magnetic field;
periodically flipping the magnetization vectors of said precessing resonators relative to the direction of the polarizing magnetic field for reversing the defocusing effect of the precession effect of the precession of said resonators about the polarizing magnetic field to obtain spin echo resonance of said resonators;
periodically detecting the spin echo resonance of said resonators;
and
changing the period of time t between tipping of said magnetization vectors and detection of the spin echo resonance for a series of said periodically detected spin echo resonances to obtain detected gyromagnetic resonance data about said first and second spin-spin coupled groups of resonators from which to derive simplified gyromagnetic resonance spectral data.

2 more elements

In a gyromagnetic resonance spectrometer, operative upon an assembly of first and second groups of gyromagnetic resonators immersed in a polarizing magnetic field wherein the magnetization vectors of said gyromagnetic resonators precess about said polarizing magnetic field, said first and second groups being coupled through spin-spin interaction, said spin-spin interaction causing a defocusing effect whereby the phase coherence of precession among said resonators is progressively lost:

means for periodically tipping the magntization vectors of said spin-spin coupled first and second groups of gyromagnetic resonators with respect to said polarizing magnetic field;
means for periodically flipping the magnetization vectors of said precessing resonantors relative to the direction of the polarizing magnetic field for reversing the defocusing effect of the precession of said resonators about said polarizing magnetic field to obtain spin echo resonances of said resonators;
means for periodically detecting the spin echo resonance of said resonators;
and
means for changing the period of time t between tipping of said magnetization vectors and detection of the spin echo resonance for a series of said periodically detected spin echo resonances to obtain detected gyromagnetic resonance data about said first and second spin-spin coupled groups of resonators from which to derive simplified gyromagnetic resonance spectral data.

2 more elements

Dependencies are inferred from the claim text.

Gyromagnetic resonance spectroscopy employing spin echo spin-spin decoupling and two-dimensional spreading

Life of this patent

Gyromagnetic resonance spectroscopy employing spin echo spin-spin decoupling and two-dimensional spreading

Life of this patent

Abstract

Claims14