Measurement of Distances Between Electron Spins Using Pulsed EPR

Abstract

Distances between unpaired electrons ranging from ca. 15 Å to > 50 Å can be measured by pulsed electron paramagnetic resonance (EPR) techniques. Techniques are available to measure distances between two slowly relaxing centers or between a rapidly relaxing center and a slowly relaxing center. An overview of these methods is provided with an emphasis on recent examples that demonstrate the power of these techniques.