- unpaired electron
- 不成对电子
English-Chinese chemistry dictionary (英汉化学大词典). 2013.
unpaired electron
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Unpaired electron — In chemistry an unpaired electron is a electron that occupies an orbital singly, rather than as part of an electron pair.As the formation of electron pairs is often energetically favorable, either in the form of a chemical bond or as a lone pair … Wikipedia
unpaired electron — noun An electron, in an atomic orbital, for which there is no other electron in the same orbital but with opposite spin; a characteristic of free radicals and other reactive species … Wiktionary
Electron paramagnetic resonance — (EPR) or electron spin resonance (ESR) spectroscopy is a technique for studying chemical species that have one or more unpaired electrons, such as organic and inorganic free radicals or inorganic complexes possessing a transition metal ion. The… … Wikipedia
Electron pair — In chemistry, an electron pair consists of two electrons that occupy the same orbital but have opposite spins.Because electrons are fermions, the Pauli exclusion principle forbids these particles from having exactly the same quantum numbers.… … Wikipedia
electron paramagnetic resonance — noun Physics a phenomenon exhibited by paramagnetic substances in which the spin of an unpaired electron aligns itself with a magnetic field. Used in molecular structure analysis. Abbrev.: EPR Also, electron spin resonance …
electron spin resonance — n the resonance of unpaired electrons in a magnetic field … Medical dictionary
electron paramagnetic resonance — ▪ physics also called electron spin resonance (ESR) selective absorption of weak radio frequency electromagnetic radiation (in the microwave region) by unpaired electrons in the atomic structure of certain materials that simultaneously… … Universalium
electron spin resonance (ESR) — or electron paramagnetic resonance (EPR) Technique of spectroscopic analysis (see spectroscopy) used to identify paramagnetic substances (see paramagnetism) and investigate the nature of the bonding within molecules by identifying unpaired… … Universalium
unpaired — adjective Date: 1648 not paired: as a. not matched or mated b. being an electron that doesn t share its orbital with another electron … New Collegiate Dictionary
electron paramagnetic resonance — (= EPR; electron spin resonance; ESR) Form of spectroscopy in which the absorption of microwave energy by a specimen in a strong magnetic field is used to study atoms or molecules with unpaired electrons … Dictionary of molecular biology
electron spin resonance — noun The absorption of radiation by species having unpaired electrons when placed in a magnetic field that is used spectroscopically to detect and study free radicals … Wiktionary
