MQ NMR hard and soft pulses for I = 1 spin systems. Raman multiple-quantum NMR

Abstract

The general problem of applying either soft, intermediate, or hard RF pulses to an I = 1 spin ensemble is discussed, within the framework of irreducible tensors. The nuclei in question are subject to a magnetic field, directed along the axis of an axially symmetric quadrupole interaction, plus an RF field applied along the x′ axis in the rotating frame. General results are given which hold for all values of the RF field ω1 chemical shift Δω, and the quadrupole beating parameter ωQ. These results are subsequently used to discuss the recently reported "Raman Magnetic Resonance" experiment, in which double-quantum coherence is both created and detected in a single-shot NMR experiment. This is a..