electron capture


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electron capture

n
1. (Nuclear Physics) the transformation of an atomic nucleus in which an electron from the atom is spontaneously absorbed into the nucleus. A proton is changed into a neutron, thereby reducing the atomic number by 1. A neutrino is emitted. The process may be detected by the consequent emission of the characteristic X-rays of the resultant element. Former name: K-capture
2. (General Physics) the spontaneous or induced recombination of free electrons with ions or by transfer from other atoms or ions
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Muir et al., "Quantifying C10-C13 polychloroalkanes in environmental samples by high-resolution gas chromatography electron capture negative ion high-resolution mass spectrometry," Analytical Chemistry, vol.
Moreover, spontaneous electron capture decay is energetically forbidden, since this is allowed for [E.sub.x] < [DELTA] - (b + [m.sub.[nu]]).
Therefore [S.sub.eff] is calculated assuming that the electron capture cross-sections of SRH centers and of the neutral amphoteric centers are equal ([[sigma].sub.n] = [[sigma].sup.0.sub.n]) and are 100 times larger than their hole capture cross-sections such that [[sigma].sub.n]/[[sigma].sub.p] = [[sigma].sup.0.sub.n]/[[sigma].sup.0.sub.p] = 100.
Unterrainer, "Ultrafast intraband spectroscopy of electron capture and relaxation in InAs/GaAs quantum dots," Applied Physics Letters, vol.
(2009), using gas chromatography with electron capture detection (GC-ECD), found that 4,4'-DDE was frequently present in Chinese propolis than other pesticides, such as [beta]-HCH, [delta]-HCH and heptachlor.
Determination of eight synthetic pyrethroids in bovine fat by gas chromatography with electron capture detection.
Liquid-liquid extraction and gas chromatography with an electron capture detector was used for the determination of THMs.
Also, the gas is easily detectable with a low (0.01 ppm) minimum detection level with readily accessible portable infrared spectrophotometers or electron capture devices.
Washington State University (Pullman, WA) has patented novel protein interaction reporter (PIR) compounds (e.g., formulas I and II), comprising at least two protein reactive moieties (e.g., N-hydroxysuccinamide), each linked to a reporter moiety (e.g., mass reporter) by a covalent labile bond that is differentially cleavable with respect to peptide bonds (e.g., by a method such as collisional activation in a mass spectrometer, activation by electron capture dissociation, photoactivation, etc.), wherein the reporter moiety is operatively releasable from the PIR agent upon cleavage of the labile bonds, the released reporter moiety having a characteristic identifying property or label (e.g., m/z value).
Hitachi High-Technologies added electron capture dissociation to its LC-IT-TOF system via a module on the front end of the mass spectrometer.

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