This concerns the process whereby new
ionization species are formed when gaseous molecules interact with ions. The process may involve
transfer of an electron,
proton or other charged species between the reactants. When a positive ion results from
chemical
ionization, the term may be used without qualification. When a negative ion is involved, the
term negative ion chemical
ionization should be used; note that negative ion formation by
attachment of a free electron does not fall within this definition. Chemical
ionization and chemi-
ionization are two terms which should not be used interchangeably.
Source:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an
appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1547
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2179