Electron spin resonance (ESR) spectroscopy is a method for studying materials with unpaired electrons. It is particularly useful for studying metal complexes and organic radicals. ESR is a sensitive, specific method for studying both radicals formed in chemical reactions and the reactions themselves. For example, when ice is decomposed by exposure to high-energy radiation, radicals such as H, OH, and H2O are produced. Such radicals can be identified and studied by ESR. Organic and inorganic radicals can be detected in electrochemical systems and in materials exposed to UV light. ESR spectroscopy is used in various branches of science, such as biology, chemistry and physics, for the detection and identification of free radicals in the solid, liquid, or gaseous state.

Soorej H Menon

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