electrons for ionization of gas phase atoms and molecules was developed by Bleakney in 1929.

Principle of operation

In this process, an electron from the analyte molecule (M) is expelled during the collision process to convert the molecule to a positive ion with an odd number of electrons. The following gas phase reaction describes the electron ionization process

:M{} + e^- -> M^{+\bullet}{} + 2e^-

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