Electron stimulated desorption from solid CO2 and a hydrogen containing CO2 matrix: A comparative study

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

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    7 Scopus citations


    We have studied electron stimulated desorption of positive ions from ∼15 monolayer (ML) film of pure solid CO2 adsorbed on polycrystalline Pt surface at ∼40 K using incident electrons in the energy range 1-31 eV. The positive ions O+, C+, CO+, CO2+, and O2+ were observed and their threshold energies are discussed. Hydrogenation of the CO2 film was found to reduce the O2+ production but the threshold remained the same as for the pure CO2 matrix. After hydrogenation of the CO2 matrix additional ions - H+, H3O+, HCO+, and H2CO+ - are observed. The formation of formaldehyde cations (with a threshold energy of 17 ± 1.5 eV) in the hydrogenated CO2 matrix has been observed for the first time and is a product of electron stimulated ion-molecule reactions, possibly via a process analogue to the so-called photosynthesis. These results could be relevant to a better understanding of the atmosphere of Mars.

    Original languageEnglish (US)
    Pages (from-to)10554-10561
    Number of pages8
    JournalJournal of Chemical Physics
    Issue number21
    StatePublished - Jun 1 1999

    ASJC Scopus subject areas

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


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