In-phase double selective excitation of coupled spin systems using excitation sculpting.

An experiment that excites exclusively coupled nuclei pairsis presented. It involves the biselective defocusing and refocusing of coupled transverse magnetization under double pulsed field gradient spin echo conditions. Application to the extraction of subspectra from crowded COSY spectra is presented, as well as a doubly selective version of the homonuclear J-resolved experiment. Copyright 1998 Academic Press.