Nuclear spin coherence transfer induced by a single static field gradient pulse

It is shown by straightforward calculations that a single static field gradient pulse can induce a transfer of the type 2IA,xIX,y → 2IA,yIX,x where IA and IX refer to spin operators of a weakly J-coupled system of two spin-12 nuclei. A simple experiment, starting with the selective excitation of spin A and ending up with antiphase doublets for both A and X nuclei, demonstrates this feature.