SORDOR pulses: expansion of the Böhlen–Bodenhausen scheme for low-power broadband magnetic resonance

Abstract. 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 the in x,y plane. Together phase-matched SORDOR-180 pulses, this enables Böhlen–Bodenhausen refocusing approach for linearly frequency-swept be extended any 90?/180? pulse–delay sequence. Example pulse shapes are characterised theory and experiment, an example application is given 19F-PROJECT experiment measuring relaxation times reduced distortions due J-coupling evolution.