Abstract
Analytical expressions for NMR lineshapes of spin- 5 2 and - 7 2 nuclei are derived assuming quadrupolar relaxation and nonextreme narrowing conditions. The effects of both chemical exchange and dynamic shifts are included in the description. Also a fourth-order quadrupolar contribution to the relaxation is briefly discussed. The results are analyzed for some typical sets of parameters. It is found that the dynamic shifts can be substantial and sometimes account for experimentally observed shifts. In an intermediate range of correlation times the signal is slightly asymmetric. The linewidth at half-height Δν 1 2 , has a broad maximum as the correlation time is varied from long times to the extreme narrowing limit. With chemical exchange effects contributing to the transverse relaxation the behavior of Δν 1 2 is more complex. In general Δν 1 2 is less sensitive to the exchange rate than for a nucleus with an exponential relaxation in each site.
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