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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.
The fragments that survive the journey through the analyzer shoot into the electron multiplier-the detector of the GCMS. The electron multiplier detects every ion of the selected mass that passes through the quadrupole analyzer. Electron multipliers use a process known as secondary electron emission. When the ions hit a surface, it causes the electrons in the outermost area of the atom to be released, which are known as secondary electrons.