Abstract
The density-operator formalism is used to obtained an expression for the nuclear spin response to a general two-pulse echo sequence in a pure nuclear quadrupole resonance experiment. The derivation is for a spin-32 system experiencing a non-axial electric field gradient and subjected to electric quadrupolar and magnetic dipole-dipole couplings. Explicit expressions for the spin response are given for four commonly used sequences in terms of the van Vleck moments. The analysis of bromine NQR data for PrBr3 provides a demonstration that quadrupolar, homonuclear dipolar and heteronuclear dipolar contributions to the van Vleck moments can be separately determined by applying appropriate spin-echo sequences.
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