Figure 9.

Experimental $T_2^{\text{'}}$ under TPPM decoupling at ${\nu }_{\mathrm{r}}=12\mathrm{kHz}$ , ${\nu }_0^{\mathrm{H}}=400\mathrm{MHz}$ and a) ${\nu }_1=286.6\mathrm{kHz}$ , b) ${\nu }_1=494.3\mathrm{kHz}$ . The solid lines represent recoupling resonance conditions for heteronuclear interactions (black) and purely homonuclear interactions (white) as described in Ref. 59. Decoupling optima lie along the dashed white line, ${\tau }_{\mathrm{p}}^{180}/cos(\varphi /1.1289)$ . Hardware configuration 8 was used with a CP contact time of 2 ms (see Table 1). Note that data was not acquired in the white region of (b).