A novel type of efficient broadband pulse, called second-order phase dispersion by optimised rotation (SORDOR), has recently been introduced. In contrast to adiabatic excitation, SORDOR-90 pulses provide effective transverse 90 rotations throughout their bandwidth, with a quadratic offset dependence of the phase in the plane. Together with phase-matched SORDOR-180 pulses, this enables the Böhlen-Bodenhausen broadband refocusing approach for linearly frequency-swept pulses to be extended to any type of 90/180 pulse-delay sequence. Example pulse shapes are characterised in theory and experiment, and an example application is given with a -PROJECT experiment for measuring relaxation times with reduced distortions due to -coupling evolution.
Copyright: © 2022 Jens D. Haller et al.