Abstract
The relaxation of multiple quantum transitions in a heteronuclear three-spin system is described in terms of Redfield theory including intramolecular dipolar and chemical shift anisotropy (CSA) mechanisms. CSA-dipolar cross-correlations, interference terms between CSA terms at different nuclear sites and cross-correlations between different dipolar interactions are illustrated and discussed. It is shown that cross-correlations between various relaxation mechanisms lead to non-exponential relaxation behaviour of multiple-quantum transitions, thus causing differential line broadening.
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