Editing Ion source (section)

===Chemi-ionization===
Chemi-ionization is the formation of an [[ion]] through the reaction of a gas phase [[atom]] or [[molecule]] with an atom or molecule in an [[excited state]].<ref>{{GoldBookRef|title=chemi-ionization|file= C01044}} C01044</ref><ref name=Klucharev1993>{{citation | last = Klucharev | first =  A. N. | year = 1993 | title = Chemi-ionization processes | journal = Physics-Uspekhi | volume = 36 | pages = 486–512 | doi = 10.1070/PU1993v036n06ABEH002162 |bibcode = 1993PhyU...36..486K | issue = 6 }}</ref> Chemi-ionization can be represented by
:<chem>G^\ast{} + M -> G{} + M^{+\bullet}{} + e^-</chem>
where G is the excited state species (indicated by the superscripted asterisk), and M is the species that is ionized by the loss of an [[electron]] to form the [[Radical (chemistry)|radical]] [[cation]] (indicated by the superscripted "plus-dot").