2005 | OriginalPaper | Buchkapitel
Electron Spin Resonance (ESR) Spectroscopy
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Electron spin resonance (ESR) spectroscopy, invented by Zavoiskii in 1944, is similar to NMR spectroscopy. ESR spectroscopy is an absorption spectroscopy which involves the absorption of radiation in the microwave region (10
4
–10
6
MHz) by substances containing one or more unpaired electrons. This absorption of microwave radiation takes place under the influence of an applied magnetic field. The substances with one or more unpaired electrons are paramagnetic and exhibit ESR. Thus, ESR spectroscopy is also called
electron paramagnetic resonance
(EPR) spectroscopy or electron magnetic resonance spectroscopy.