Abstract
The theory of nutation N.M.R. for a quadrupolar nucleus with spin quantum I = 5/2 is presented in an exact, analytical way. It is shown that the nutation spectrum is described by 9 different frequencies each dependent on the orientation of the quadrupole tensor relative to the external field. The frequencies are calculated from the eigenvalues of a 6th-degree secular equation that is reduced to 2 secular equations of order 3. This reduction is obtained by a transformation of bases. An extension of the nutation experiment, xx¯-nutation, is compared with the standard technique. The theoretical spectra are compared with experimental 27Al spectra of NH4Al(SO4)2 · 12H2O and zeolite NaA.
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