The sensitivity of one-dimensional dynamic magic-angle spinning (MAS)
and off-MAS H-2 nuclear magnetic resonance spectra to changes in the p
arameters of jump-type molecular motions is studied. The Floquet theor
y approach is used to simulate spectra of spins with I = 1, which are
involved in exchange processes in rotating solids. The solution of the
Bloch-McConnell equations for rotating samples are derived and some s
imulated frequency spectra are shown. The dependence of the lineshapes
of the center and sidebands of the MAS and off-MAS spectra on the exc
hange parameters are discussed. Experimental results of H-2 spectra of
perdeuterated dimethyl sulfone, obtained in the temperature range 20-
55 degrees C, are demonstrated. The methyl groups in this molecule und
ergo pi flips at rates that can be detected by MAS and off-MAS NMR. Th
e shapes of the experimental sidebands are compared with simulated res
ults.