Method of and apparatus for ionizing sample gas

Details Method of and apparatus for ionizing sample gas Method of and apparatus for ionizing sample gas

2006-08-15

2006-08-15

Lee, John R. (Department: 2881)

Radiant energy

Ion generation

With sample vaporizing means

C250S424000, C250S42300F

Reexamination Certificate

active

07091493

ABSTRACT:
Ionization efficiency is improved in Penning ionization capable of selective ionization. A metastable excited species of a rare gas is produced by introducing the rare gas into an ionization space and inducing an electrical discharge, a sample gas is introduced into the ionization space and Penning ionization is produced owing to collision between the sample gas and the metastable excited species of the rare gas. Electrons released from atoms or molecules positively ionized by Penning ionization are captured by applying a positive potential to an electron-capture electrode placed in the ionization space, and the atoms or molecules positively ionized are guided to a mass analyzer.

REFERENCES:
patent: 4372928 (1983-02-01), Chatelet et al.
patent: 6124675 (2000-09-01), Bertrand et al.
Kenzo Hiraoka, “Principle and Application of Low-Temperature Plasmas” vol. 33, No. 5, Oct. 1985, pp. 271-306.

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