Indirect detection of nuclear spins of low gyromagentic ratio co

Details Indirect detection of nuclear spins of low gyromagentic ratio co Indirect detection of nuclear spins of low gyromagentic ratio co

1979-02-21

1980-12-09

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324314, G01N 2700

Patent

active

042387353

ABSTRACT:
In a heteronuclear system, the indirect detection of nuclei S, of weak gyromagnetic ratio, coupled to nuclei I, of strong gyromagnetic ratio, is accomplished by generation of zero and double quantum coherence between the I and S spin systems, during a preparatory period, t.sub.p. The zero and double quantum transitions are then interchanged at the midpoint of the evolution period, t.sub.1, producing an echo modulated only by S and I-I interactions at the end of the period t.sub.1, at which time the zero and double quantum coherence is then converted to I spin single quantum coherence yielding a free induction decay wave form S(t.sub.2) for given t.sub.1. The period, t.sub.1, is then varied to obtain a two-dimensional function S(t.sub.1, t.sub.2) which is then fully transformed to the frequency domain obtaining S(.omega..sub.1, .omega..sub.2) whereby the chemical shift of the coupled S spin is obtained along the .omega..sub.1 axis and the chemical shift of the I spin is obtained along the .omega..sub.2 axis.

REFERENCES:
patent: 3792346 (1974-02-01), Gibby
patent: 3810001 (1974-05-01), Ernst
patent: 4068161 (1978-01-01), Ernst

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