We present here a simple refocused modification, r TPPM, of the Two-Pulse Phase-Modulation (TPPM) heteronuclear decoupling method, which improves decoupling and makes the sequence much more robust with respect to essential experimental parameters. The modified sequence is compared with the established TPPM sequence and a variety of other decoupling sequences at low to moderate magic-angle spinning frequencies. Simulations are shown to compare TPPM and r TPPM with respect to various experimental parameters. The observations from simulations are corroborated with experimental findings at two spinning frequencies on U-13C-glycine and U-13C-L-histidine.HCl. H2O.
- Heteronuclear dipolar decoupling
- Magic-angle spinning
- r TPPM
- Solid-state NMR
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Condensed Matter Physics