Swept-frequency two-pulse phase modulation for heteronuclear dipolar decoupling in solid-state NMR

An improvement in heteronuclear dipolar decoupling sequences in solid-state NMR can result from sweeping adiabatically about the HORROR condition in a modulated frame of reference. A sequence is designed to achieve this by modulating pulse durations in TPPM and is called swept-frequency two-pulse phase modulation which is shown to be robust with respect to various experimental parameters.