Single and Multiple-Selective Excitation Combined with Pulsed Field Gradients

Applications of selective, multiselective, and semiselective pulses with pulsed field gradients are described. The use of multiple-selective excitation and PFGs for coherence selection in the selective one-dimensional experiments results in spectra devoid of artifacts and with remarkable solvent suppression. Multiple-selective excitation is also employed in an experiment called Multigate, a variant of the well-known WATERGATE experiment, in order to achieve multiple solvent signal suppression. Finally, new pulse sequences are shown for recording pure absorption ω₁semiselective PFG NOESY, ROESY, and TOCSY experiments. The merits and limitations of these experiments are discussed.