electron capture


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e·lec·tron cap·ture

a mode of radioactive disintegration, in which an orbital electron, usually from the K shell, is captured by the nucleus, converting a proton into a neutron with ejection of a neutrino and emission of a gamma ray, and emission of characteristic x-rays as the missing K-shell electron is replaced.
Synonym(s): K capture

electron capture

a radioactive decay process in which an atomic nucleus with an excess of protons draws an electron into itself, creating a neutron out of a proton and thus decreasing the atomic number by 1. Often the resulting nucleus is unstable and achieves stability by giving off a gamma ray.

e·lec·tron cap·ture

(ē-lektron kapshŭr)
Mode of radioactive disintegration, in which an orbital electron, usually from the K shell, is captured by the nucleus, converting a proton into a neutron with ejection of a neutrino and emission of a gamma ray and emission of characteristic x-rays as the missing K-shell electron is replaced.
References in periodicals archive ?
Quantity: lot 1 - thermal imager - 1 unit; lot 2 - oxygen analyzer - 1 unit; lot 3 - tester of optical networks of type JDSU ONT - 606D (or equivalent) - 1 unit; lot 4 - gas chromatograph of type Agilent 7890 with flame-ionization detector and electron capture detector and headspace introduction automatic device (or equivalent) - 1 unit
4 - gas chromatograph Agilent 7890 type of flame parieto-ionization detector and electron capture detector and automatic input device equilibrium vapor phase (or equivalent))
Depending on the pesticide residue being tested for and the products being tested, pesticide testing is performed on high performance liquid chromatograph with tandem mass spectrometers (HPLC-MS/MS), gas chromatograph with tandem mass spectrometers (GC-MS/MS), high performance liquid chromatograph with mass spectrometer (HPLC/MS), gas chromatograph with mass spectrometer (GC/MS) or gas chromatograph with electron capture detector GC/ECD.
The instruments segment is further classified down to systems and types of detectors, namely flame ionization detectors, thermal conductivity detectors, electron capture detector (ECD), photo ionization detector (PID), nitrogen phosphorous detector (NPD), flame photometric detector, and mass detectors.
Among the topics are electron capture processes in ion-atom collisions at intermediate projectile energies, recent advances in the theory and modeling of multiple processes in heavy-particle collisions, distorted wave methodologies for energetic ion-atom collisions, and studying inelastic processes in ion-water collisions using classical trajectory Monte Carlo and semiclassical methods.
The most notable device is the electron capture detector, an instrument that has made it possible to detect atmospheric chlorofluorocarbons, and ultimately assisted in knowledge of the ozone layer's depletion in our stratosphere.

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