Relaxation compensated and intensity recovered dynamics of cross polarization in the frame of reciprocity relation

Through combing the scheme of TORQUE (by Tekely et al.) with cross depolarization (CDP), we derived a relaxation compensated and intensity recovered Hartmann–Hahn CP dynamics in the frame of reciprocity relation. As a result, the CP dynamics of TORQUE (CPT1ρQ(t)) emerges from the T1ρ damped dynamics and upon normalization of the intensities by the reciprocity relation, it is perfectly symmetric with respect to the CDP(t). Along with an enhancement factor of CP defined as η(t) = [ 1 - CDP ( t ) ] ( γ I / γ S ) and a scaling factor between two peak intensities, λ ( t ′ ) = PI CP ( t ′ ) /PIT1ρQ(t′), this method provides a convenient, robust, and quantitative measure of CP spectra.