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| radiation in the form of elementary particles emitted by an atomic nucleus produced by decay of radioactive substances or by nuclear fission |
| the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts |
| electron spin resonance | |
| —n | |
| See also nuclear magnetic resonance ESR a technique for investigating paramagnetic substances by subjecting them to high-frequency radiation in a strong magnetic field. Changes in the spin of unpaired electrons cause radiation to be absorbed at certain frequencies | |
electron spin resonance n.
Abbr. ESR A spectrometric method, based on measurement of the spins of unpaired electrons in a magnetic field, for detecting and estimating free radicals in organic reactions.