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Abstract

A method serves for recording nuclear resonance spectra of test samples having at least three groups of spins. A first group is coupled to a second group, while a third group is uncoupled relative to the second group but has a spectral position, e.g. chemical shift, which is substantially identical only to that of the first group. For obtaining an isolated image of the signal of the first group, one suppresses the signal of the third group. A pulse sequence of three r.f. pulses (10, 13, 22) are irradiated upon the sample in a manner known as such. The second r.f. pulse (13) is applied in such a way that the magnetization of the spins of the first group is transferred to the spins of the second group by polarization transfer. Then, a first magnetic gradient field pulse (17, 23), with dephasing effect for the spins of the said second group, is exerted upon the sample. The third r.f. pulse (22) is adjusted in such a way that the magnetization of the spins of the said second group is retransferred, by polarization re-transfer, to the spins of the first group, which is finally exposed to a second magnetic gradient field pulse (23), being rephasing for the spins of the first group (A).

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