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Chemistry

How Electron Paramagnetic Resonance Detects Radicals in Chemical Reactions

Quick fact

EPR is so sensitive to unpaired electrons that it can detect radical concentrations as low as 10^-10 molar, and it can even follow the formation and decay of radicals in a reaction in real time.

Why this is interesting

You’ve probably heard of MRI and NMR, but did you know that a related technique can actually 'see' the unpaired electrons that drive many chemical reactions? How does it work?