We have developed, together with the Emsley group in Lyon, France, high-resolution ¹H DQ pulse sequences employing DUMBO ¹H homonuclear decoupling: in 2004, we presented a ¹H-¹H DQ-SQ (single-quantum) 2D experiment that was demonstrated to achieve an up to factor of nine resolution enhancement as compared to fast MAS for a dipeptide (Brown 2004); in 2010, we presented a ¹H (DQ) -¹³C (SQ) pulse sequence employing the refocused INEPT pulse sequence element to transfer coherence, which allows the better resolution of ¹H DQ peaks via the ¹³C dimension (Webber 2010).

Together with other researchers (including Malcolm Levitt, Southampton & the Emsley (Lyon, France) & Massiot (Orléans, France) groups), we have presented a description that combines analytical theory, experiment and density-matrix simulation for the homonuclear spin-echo (Duma 2004) and refocused INADEQUATE (Fayon 2005 & Cadars 2007) experiments that are used to quantitatively determine J couplings and demonstrate through-bond connectivities, respectively. In 2009, we presented the first-ever ¹⁵N-¹⁷O experiments, by which 2hJ¹⁵N-¹⁷O couplings across NH...O hydrogen bonds were quantitatively determined for uracil (Hung 2009).

We have also shown how the REINE (REfocused INadequate spin-Echo) experiment first presented by Cadars et al (Cadars 2007) can be applied to a phosphate glass to reveal correlations between the ²J_PP coupling and the ³¹P chemical shifts of the coupled nuclei for apparently featureless DQ peaks (Guerry 2009).