Cross sections for positron scattering from ethane

Luca Chiari, Antonio Zecca, E Trainotti, Marcio Bettega, S Sanchez, Marcio Varella, Marco Lima, Michael Brunger

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    We report experimental and theoretical cross sections for positron scattering from the fundamental organic-chemistry molecule ethane (C 2H6). The experimental total cross sections (TCSs) were obtained using a linear transmission technique, for energies in the range 0.1-70 eV and with an energy resolution of ∼0.25 eV (full width at half maximum). Agreement, over the common energy range, with the earlier TCS measurements of Floeder is excellent, while both the present results and those of Floeder are consistently higher in magnitude than the data of Sueoka and Mori. The present calculations employed the Schwinger multichannel method and were performed in the static plus polarization approximation for energies up to 10 eV. Our calculated elastic integral cross sections (ICSs) indicate a Ramsauer-Townsend minimum at around 1.4 eV in the Ag scattering symmetry, and a virtual state. In addition we calculated from our scattering cross section a scattering length of -13.83a0. Agreement between our measured TCS and calculated elastic ICS is found to be only qualitative, although this is perhaps not so surprising given the TCS below 10 eV in principle includes contributions from rotational, vibrational, and electronic-state excitation and positronium formation whereas the calculation does not.

    Original languageEnglish
    Article number032707
    Pages (from-to)032707
    Number of pages7
    JournalPhysical Review A
    Volume87
    Issue number3
    DOIs
    Publication statusPublished - 15 Mar 2013

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