Double quantum coherence in pure nuclear quadrupole resonance spectroscopy

The results of a theoretical investigation on double quantum coherence in pure nuclear quadrupole resonance (NQR) for spin I = 5/2 with axial symmetry in a single crystal are presented. Using the tensor operator formalism it is shown that the creation and detection of double quantum coherence can be done by the application of a pulse scheme of the form (π/2)x (2ωQ)(π)x (ωQ)-τ-(π)x (2ωQ). The effect of resonance off-set on the double quantum coherence is also considered