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Abstract

In an imaging method for spectroscopy of nuclear quadrupole resonances (NQR) with solid samples to which an RF field having a pulse duration t.sub.p with a base amplitude B.sub.10 constant over the sample length for magnetic excitation of NQR with resonance frequencies .omega. and with magnetic moments coupled to the nuclear quadrupole moments is applied and the NQR signal emitting from the sample is time-depentently detected, the RF field is superimposed by a position-dependent field contribution corresponding to a constant gradient B.sub.1.sup.x which yields together with the constant RF field a position-dependent RF field B.sub.1 (x), for each resonance frequency contained in the detected NQR signal the amplitude including its sign is determined, the measurements are carried out at different flip angles.sqroot.3.multidot..gamma..multidot.B.sub.1 (x).multidot.t.sub.p of the excited magnetic moment, the amplitudes including their signs which depend on the flip angle are subjected to a Fourier transformation and finally therefrom the x dependent density distribution of the observed nuclei is reconstructed. The method does without applying of an external B.sub.0 field, so that it can be carried out with a compacter measuring apparatus, in which the sample can also be situated partly outside. Effects of the Zeeman splitting do not have to be taken into consideration.

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