Suppression of probe background signals via B1 field inhomogeneity

► Applying a long pulse in DEPTH suppresses residual background from strong B1 fields. ► Mechanism: coherence dephasing in nutation frame via B1 field inhomogeneity. ► Weak internal spin interactions required to attain efficient and uniform excitation. ► Readily combined with spin-echo based sequences, such as REDOR and TRAPDOR.