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Abstract

For recording three-dimensional nuclear magnetic resonance spectra the nuclear spin-system must be excited by three 90.degree. pulses, with variation of the pulse intervals t.sub.1 and t.sub.m. Instead of varying the two pulse intervals separately, which would be required for recording the two time dimensions defined by t.sub.1 and t.sub.m, the mixing time t.sub.m is simultaneously varied proportionally to the evolution period each time the measurement is repeated with a varied evolution period t.sub.1, so that t.sub.m =.kappa.t.sub.1. K is so selected that the interesting mixing time period is completely covered by the predetermined number of measurements taken with different evolution times. The variation of t.sub.m is reflected by the shape of the resonance lines and can be determined also by reverse transformation of the individual resonance lines into the time domain. A spectrometer for carrying out this method may conveniently be adapted to permit setting of the pulse interval t.sub.1 and the proportionality factor K, to form therefrom automatically the second pulse interval t.sub.m.

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First Claim