Also known as electron paramagnetic resonance (EPR), this method is used to determine whether radicals are formed in solution. Although it is very useful at this purpose, the sensitivity toward determination of structure is poor. It is the study of molecules containing unpaired electrons by observing the magnetic fields at which they come into resonance with monochromatic radiation. The radiation is in the microwave region, and the magnetic fields are about .3 Tesla. It can be used to study radicals generated either through chemical reactions or radiation, as well as d-metal complexes and molecules in triplet states.
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