the flipping back and forth between two spin directions of electrons in a magnetic field when electromagnetic radiation of the proper frequency is applied.
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 ESR See also nuclear magnetic resonance
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.
noun 1. a telescope in which an infrared image of a distant object is focused on the photosensitive cathode of an image tube. noun 1. an astronomical telescope with an attachment for converting the infrared radiation emitted from the surface of planets into a visible image
noun 1. an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents. noun 1. an electrical device, such as a valve, in which a flow of electrons between electrodes takes place Also called vacuum tube Sometimes shortened to […]
noun, Biochemistry. 1. the stepwise transfer of electrons from one carrier molecule, as a flavoprotein or a cytochrome, to another along the respiratory chain and ultimately to oxygen during the aerobic production of ATP. noun 1. (biochem) the metabolic process in mitochondria or chloroplasts, in which electrons are transferred in stages from energy-rich compounds to […]
[ih-lek-tron-vohlt] /ɪˈlɛk trɒnˌvoʊlt/ noun, Physics. 1. a unit of energy, equal to the energy acquired by an electron accelerating through a potential difference of one volt and equivalent to 1.602 × 10 −19 joules. Abbreviation: eV, ev. /ɪˌlɛktrɒnˈvəʊlt/ noun 1. a unit of energy equal to the work done on an electron accelerated through a […]