Positron collisions with ethene

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

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    Abstract

    We present experimental and theoretical cross sections for positron collisions with ethene molecules. The experimental total cross sections (TCSs) were obtained with a linear transmission technique, for energies from 0.1 eV up to 70 eV. The calculations employed the Schwinger multichannel method and were performed in the static plus polarization approximation for energies up to 10 eV. Our calculated elastic cross sections indicate a Ramsauer-Townsend minimum around 2.8 eV and a virtual state, in agreement with previous calculations by da Silva. We found reasonable agreement between the calculated elastic integral cross section and the measured total cross section below the positronium formation threshold. The present results are also in quite good agreement with available theoretical and experimental data, although for the experiments this is only true for TCSs above about 7 eV.

    Original languageEnglish
    Article number022709
    Pages (from-to)022709-1-022709-7
    Number of pages7
    JournalPhysical Review A
    Volume86
    Issue number2
    DOIs
    Publication statusPublished - 2012

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    Bettega, M., Sanchez, S., Varella, M., Lima, M., Chiari, L., Zecca, A., Trainotti, E., & Brunger, M. (2012). Positron collisions with ethene. Physical Review A, 86(2), 022709-1-022709-7. [022709]. https://doi.org/10.1103/PhysRevA.86.022709