Ion-attachment mass spectrometry

Ion-attachment mass spectrometry (IAMS) is a form of mass spectrometry that uses a "soft" form of ionization similar to chemical ionization in which a cation is attached to the analyte molecule in a reactive collision, M + X + + A ⟶ MX + + A {\displaystyle {\ce {{M}+ {X+}+ A -> {MX+}+ A}}} where M is the analyte molecule, X+ is the cation, and A is a non-reacting collision partner. == Principle == This technique is applicable to gases or any materials that can be vaporized.

Source: Wikipedia — Ion-attachment mass spectrometry (CC BY-SA 4.0)