V. Gerardymontouillout et al., ODESSA, A NEW 1D NMR EXCHANGE EXPERIMENT FOR CHEMICALLY EQUIVALENT NUCLEI IN ROTATING SOLIDS, Journal of magnetic resonance. Series A, 123(1), 1996, pp. 7-15
A new 1D NMR exchange experiment in the slow-motion regime of spinning
solids, with chemically equivalent nuclei exhibiting quadrupole coupl
ing or chemical-shift anisotropy, is proposed. It consists of the usua
l three-pulse sequence for 2D exchange spectroscopy, P1-t(1)-P2-tau(m)
-P3-t-acquisition, but with the evolution time fixed at one-half a spi
nning period, t(1) = T-R/2, and a mixing time equal to an integer mult
iple thereof, tau(m) = GT(R). The magnetic polarizations associated wi
th the various spinning sidebands are then polarized in alternate dire
ctions at the beginning of the mixing time. Dynamic processes during t
au(m) redistribute the polarizations, resulting in modified sideband p
atterns during the detection time, t. Experimental results-are present
ed for carbon-13 and deuterium in dimethyl sulfone, which undergoes mo
lecular reorientation in the solid state. The results are compared wit
h simulations which include the effect of reorientation and longitudin
al relaxation. (C) 1996 Academic Press, Inc.