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Electron capture (K-electron capture, also K-capture, or L-electron capture, L-capture) is a process in which the proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, usually from the K or L electron shells.
[2] [3] [4] Both forms of the electron capture decay release further photons, [Note 2] when electrons from the outer shells fall into the inner shells to replace the electron taken from there. The EC decay of 40 K explains the large abundance of argon (nearly 1%) in the Earth's atmosphere, as well as prevalence of 40 Ar over other isotopes.
Resonance electron capture [3] is also known as nondissociative EC. The compound captures an electron to form a radical anion. [4] The energy of the electrons are about 0 eV. The electrons can be created in the Electron Ionization source with moderating gas such as H 2, CH 4, i-C 4 H 10, NH 3, N 2, and Ar. [5] After the ion captures the electron, the complex formed can stabilize during ...
The theory of electron capture was first discussed by Gian-Carlo Wick in a 1934 paper, and then developed by Hideki Yukawa and others. K-electron capture was first observed in 1937 by Luis Alvarez, in the nuclide 48 V. [12] [13] [14] Alvarez went on to study electron capture in 67 Ga and other nuclides. [12] [15] [16]
The figure on the right shows the electron spectrum of 203 Hg, measured by means of a magnetic spectrometer. It includes the continuous beta spectrum and K-, L-, and M-lines due to internal conversion. Since the binding energy of the K electrons in 203 Tl is 85 keV, the K line has an energy of 279 − 85 = 194 keV. Due to lesser binding ...
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Iron-55 decays via electron capture to manganese-55 with a half-life of 2.737 years. [1] The electrons around the nucleus rapidly adjust themselves to the lowered charge without leaving their shell, and shortly thereafter the vacancy in the "K" shell left by the nuclear-captured electron is filled by an electron from a higher shell.
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