Unexpected high energy ions from a chemical ionization source

Jingping Peng, E. V. Moskovets, Gregory I. Gellene

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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.

Original languageEnglish
Pages (from-to)1262-1265
Number of pages4
JournalJournal of the American Society for Mass Spectrometry
Issue number12
StatePublished - Dec 1997


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