JMSSJ On-line, Vol. 58 (2010) No. 3, pp. 093-110
Fundamentals of Mass Spectrometry -Gas Phase Ion/Molecule Reactions-
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    Kenzo HIRAOKA

    Clean Energy Research Center, University of Yamanashi, Kofu, YAMANASHI, JAPAN

The ionization is the first step for the mass spectrometry. The ion/molecule reactions play major roles not only in the gas-phase chemical ionization but also in the ionization processes in condensed phases, e.g., secondary ion mass spectrometry (SIMS), matrix-assisted laser desorption/ionization (MALDI), electrospray ionization (ESI), field desorption (FD), and field ionization (FI). In general, the mass spectra obtained by various ionization methods reflect the outcome of complex ion/molecule reactions taking place in the respective ionization method. Thus, fundamental knowledge on the ion/molecule reactions is indispensable to make the mass spectrometry as the superb analytical technique. In this chapter, the fundamentals of ion/molecule reactions will be described.

Key words: Ion/molecule reaction, Proton transfer reaction, Charge transfer reaction, Cluster ion, Negative ion

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