Abstract
A modification of the apparatus that we have been using to measure absolute total cross sections (Q T′s) for positron and electron scattering by alkali metal atoms has enabled us to more easily obtainQ T′s at low energies (<10 eV). Our positron-K and-RbQ T measurements now extend from 1 to 98 eV and we have made the correspondingQ T measurements for electrons in the same system using the same technique (a beam transmission technique). Our measured positron-K and-RbQ T values show a peak in the vicinity of 6 eV and decrease substantially as the positron energy is reduced below 6 eV, in sharp contrast to the results obtained in recent 5-state close-coupling approximation calculations. At higher energies (above 10 eV), we have found that the same calculations are in quite good agreement with our measured positron-K and-RbQ T′s. Our measurements of the correspondingQ T′s for electrons below 10 eV do not show a peak, but rather continue to increase as the energy is decreased.
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Stein, T.S., Kauppila, W.E., Kwan, C.K. et al. Measurements of total cross sections for positron-K and-Rb scattering. Hyperfine Interact 73, 205–212 (1992). https://doi.org/10.1007/BF02628219
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DOI: https://doi.org/10.1007/BF02628219