Electron ionization
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Electron ionization is an ionization method in which energetic electrons interact with solid or gas phase atoms or molecules to produce ions. EI was one of the first ionization techniques developed fo
Arthur J. Dempster
Chemical ionization
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Chemical ionization is a soft ionization technique used in mass spectrometry. This was first introduced by Burnaby Munson and Frank H. Field in 1966. This technique is a branch of gaseous ion-molecule
Electron ionization
…dichloromethane and further analyzed using gas chromatography–tandem mass spectrometry (GC–MS–MS). The optimum ionization method can be identified as EI or chemical ionization (CI) for this single injection of the extract. This method is fast, simple and cost effective since high numbers of pesticides can be determined by GC…
Peroxynitrate chemical ionization mass spectrometer at the US National Oceanic and Atmospheric Administration