Abstract
The 13C dipolar powder spectra of 13CH3 31PO(OH)2 at room temperature and 13CH3 19F at low temperature (T=25 K) are reported. An intense peak is observed at the center of the Pake doublet. This phenomenon is explained by the transverse cross relaxation mechanism between the 13C and either the 31P or 19F nuclei. This theory shows the importance of the nonsecular terms in the Redfield relaxation theory. The chemical shielding tensors and dipolar coupling constants of these two molecules are obtained by fitting the experimental spectra.
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