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From Wikipedia, the free encyclopedia. Schematic of an electron capture detector for a gas chromatograph with a 63 Ni source. An electron capture detector (ECD) is a device for detecting atoms and molecules in a gas through the attachment of electrons via electron capture ionization. The device was invented in 1957 by James Lovelock and is used in gas chromatography to detect trace amounts of chemical compounds in a sample.
1 Electron CaptureIt is possible for a proton in the nucleus to âcaptureâ an electron and turn into a neutron releasing a neutrino e p e n e. 2  9. 3  Feynmanâs Diagram for e-captureThe force responsible for electron capture is the weak force.4  So, the exchange particle is the W+. 10. 2  Electron â Proton CollisionWhen an electron and a proton collide the proton turns into a neutron releasing a neutrino e p e n e. 3  11. 4  Feynmanâs Diagram for e- - p collisionsThe force responsible for this collision is the weak force.