A 250 MHz EPR spectrometer with rapid phase-error correction for imaging large biological specimens

Abstract

A high-sensitivity, continuous-wave spectrometer for in vivo electron paramagnetic resonance imaging and spectroscopy of large samples is described. The magnet assembly has a sample bore of 0.5 m and continuous field gradients of up to 40 mT m-1 can be applied. Automatic phase control has been included to compensate for motional artefacts. This utilizes an electronic phase-shifter for rapid correction of phase-error noise.