D. Massiot et al., QPASS - TOWARDS HIGHER RESOLUTION IN NMR OF HALF-INTEGER QUADRUPOLAR NUCLEI WITH HIGH QUADRUPOLAR COUPLINGS, Journal de chimie physique et de physico-chimie biologique, 95(2), 1998, pp. 270-279
We explain the newly described QPASS (Quadrupolar Phase Adjusted Spinn
ing Sideband) pulse sequence (Massiot et al. 1997) that opens a way fo
r obtaining better resolved NMR spectra of half integer quadrupolar nu
clei undergoing large second order quadrupolar broadenings like Ga-71.
This two dimensional experiment is based on the modulation of each sp
inning sideband by its order with nine pi pulses, from which an infini
te spinning rate sideband free spectrum can be reconstructed.