Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 19: Electrons, incl. Scattering and Recombination
A 19.1: Vortrag
Freitag, 6. April 2001, 15:45–16:00, H1028
Absolute electron impact ionization cross sections of Ne, Ar, Kr, and Xe — •Mathias Richter1, G. Ulm1, A.A. Sorokin2, L.A. Shmaenok2, and S.V. Bobashev2 — 1Physikalisch-Technische Bundesanstalt, Abbestrasse 2-12, 10587 Berlin, Germany — 2Ioffe Physico-Technical Institute RAS, Polytekhnicheskaya 26, 194021 St. Petersburg, Russia
A method and apparatus for precise measurements of absolute total cross-sections for electron-impact ionization have been developed. The method is based on the comparison of the total ion yields resulting from ionization of rare gases by electrons and photons. Ratios of total cross sections for electron-impact ionization and photoionization in Ne, Ar, Kr, and Xe in the energy range from 140 eV to 4000 eV for electrons and from 16 eV to 1012 eV for photons were measured. On the basis of our measured cross-section ratios and well-known total photoionization cross section data, we deduced absolute total electron-impact ionization cross sections for Ne, Ar, Kr, and Xe with relative standard uncertainties as low as 0.03. A comparison of the cross-section data with published experimental and theoretical results is given.
A.A. Sorokin et al., Rev. A 58 (1998) 2900; Phys. Rev. A 61 (2000) 022723.