electron spin resonance (ESR)
A method of studying the structure of molecules by finding the positions of electrons within them. ESR is a spectrographic technique and is applicable only to paramagnetic substances (see paramagnetism. It locates unpaired electrons by their spin and by the way they align themselves in an external magnetic field when the molecule absorbs microwave radiation.
Related categories• SPECTRA AND SPECTROSCOPY
• ATOMIC AND NUCLEAR PHYSICS
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