Synthesis of dioxygen in a CO2 matrix: Positive ion desorption at the solid ionisation threshold

L. Šiller*, Mohamed Nejib Hedhili, Y. Le Coat, M. Tronc, R. Azria

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    2 Scopus citations


    O2+ ion desorption as a reaction product from solid CO2 ice has been observed for the first time. The desorption threshold is at the ionisation potential for solid CO2, ~6 eV below that for O2+ production in the gas phase. The threshold for CO+ ions is also substantially below the gas phase threshold. No positive ion desorption has been seen at or below the solid ionisation threshold in any condensed gas before. Both solid threshold energies are a result of multielectron excitations.

    Original languageEnglish (US)
    Pages (from-to)776-780
    Number of pages5
    JournalChemical Physics Letters
    Issue number5-6
    StatePublished - May 29 1998

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry


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