Studies on the Bombardment of Condensed Molecular Gases at Liquid-He Temperatures by keV Electrons and Light Ions

P Børgesen

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    Films of solid H2 D2 and N2 were irradiated with keV electrons and ions. Stopping cross sections and ranges of 0.3-10 keV/amu light ions in solid H2 and D2 are in good agreement with experimental and theoretical data on gaseous targets. In contrast, both stopping cross section and range measurements in solid N2 suggest that the stopping here is only about half of that in N2-gas. This "phaseeffect" is further supported by secondary electron emission measurements. Secondary electron emission coefficients for 2-10 keV H1+, H2+, H3+, D3+, D2H+, 4He+, 14N+, 20Ne+ incident on solids H2, D2 and N2 are in reasonable agreement with previous results for electron-incidence. The rather large erosion yields for 1-3 keV electrons incident on solid D2 depend strongly on target thickness (for thin films)/ but weakly on energy. Bulk yields for 2 keV electrons were ∼ 8 H2/electron, ∼ 4 D2/electron and ∼ 0.5 N2/electron. Secondary ion emission during ion bombardment seems to be predominantly reflected projectiles in the case of N2-targets, while it may be explained as sputtered particles from H2- and D2-targets. Preliminary results en the erosion of solid H2 and D2 by keV light ions indicate very large erosion yields (~ 400 H2/atom for 2 keV protons) increasing strongly with energy. Most of the applied methods were new in the present context and therefore carefylly investigated.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages161
    ISBN (Print)87-550-0875-5
    Publication statusPublished - 1982
    SeriesDenmark. Forskningscenter Risoe. Risoe-R


    • Risø-R-457


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