Continuous-wave rapid scan EPR

Rapid scan (RS) is a novel and, at the same time, an ‘aged’ EPR method. The spin system evolution under the rapid-passage conditions was well-understood at the dawn of magnetic resonance. The recent progress has been made mostly along the practical dimension. Algorithms and instrumentation have been developed with the goal to measure undistorted EPR spectra with enhanced sensitivity. Both frequency and magnetic field scan methods were developed. The latter, continuous-wave RS EPR, is the topic of this book chapter.