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The practical advantages of low-pressure CI are:

 No need for an expensive vacuum pumping system to handle the large

amounts of reagent gas

 Low consumption of expensive high-purity reagent gas

 Minimal contamination of the ion source

 The potential of alternating EI and CI scans without the compromises in

spectral quality typically seen in high-pressure sources

 Very good CI sensitivity in the full-scan mode

 Liquid reagents are easily used

Recommended Reading

 For more information about the theory of chemical ionization and the

interpretation of CI mass spectra, refer to Chemical Ionization Mass

Spectrometry by Alex G. Harrison, CRC Press, Boca Raton, Florida, 1983.

 For a comparison of high-pressure and low-pressure CI in an ion trap, refer

to S.M. Boswell, R.E. Mather, and J.F.J. Todd, “Chemical Ionization in the

Ion Trap: a Comparative Study,” Int. J. Mass Spectrom. Ion. Proc. 99 (1990),

139-149.

 For examples of liquid CI reagents, refer to:

G.F. Bauerle, Jr., B.J. Hall, N.V. Tran, and J.S. Bradbelt, “Ion-Molecule

Reactions of Oxygenated Chemical Ionization Reagents with Vincamine”, J.

Am. Soc. Mass Spectrom. 7 (1996), 250-260.

G. Moneti, et.al, “Acetonitrile as an Effective Reactant Species for Positive-

Ion Chemical Ionization of Hydrocarbons by Ion-Trap Mass Spectrometry”,

Rapid. Commun. in Mass Spectrom., 10 (1996), 167-170.

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