Homonuclear decoupled proton NMR spectra in modest to severe inhomogeneous fields via distant dipolar interactions

On the basis of distant dipolar interactions, two new pulse sequences were proposed to obtain homonuclear broadband-decoupled proton NMR spectra in modest to severe inhomogeneous fields with time efficient acquisitions. Theoretical expressions for signals were derived according to the distant dipolar field (DDF) treatment combined with the product operator formalism. The measurements under either moderate (∼0.4 ppm) or severe (∼7 ppm) field inhomogeneity in a 500 MHz spectrometer show that the new sequences are complementary to each other and provide an attractive way to eliminate the influences of field inhomogeneities on homonuclear decoupled proton spectra.