Unexpected high energy ions from a chemical ionization source

Doubly charged rare gas cations are produced in a chemical ionization source under conditions in which the energy of the primary ionizing electrons is more than 20 eV below the energetic threshold. The formation mechanism consists of creating secondary electrons outside the ion source followed by th...

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Bibliographic Details
Published in:Journal of the American Society for Mass Spectrometry 1997-12, Vol.8 (12), p.1262-1265
Main Authors: Peng, Jingping, Moskovets, E.V., Gellene, Gregory I.
Format: Article
Language:English
Subjects:
Chemistry
Electrons
Exact sciences and technology
Ion sources
Ionization
Ions
Mass spectrometry
Organic chemistry
Positive ions
Rare gases
Reactivity and mechanisms
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Summary:Doubly charged rare gas cations are produced in a chemical ionization source under conditions in which the energy of the primary ionizing electrons is more than 20 eV below the energetic threshold. The formation mechanism consists of creating secondary electrons outside the ion source followed by the acceleration of some of these electrons into the source where they initiate high energy ionization processes. Evidence suggesting that the secondary electrons arise from ionizing collisions between accelerated ions and background gas is presented. This process is expected to occur generally when positive ion chemical ionization is performed in magnetic deflection instruments.
ISSN:1044-0305
1879-1123
DOI:10.1016/S1044-0305(97)00228-6