Showing papers by "Tilmann D. Märk published in 1979"
TL;DR: In this article, the relative cross sections for electron-impact ionization of the rare-gas Van der Waals dimers Ar/sub 2/, ArKr, Kr, Kr-sub 2/sup ts+/, KrXe/sup +/, and Xe/sub 1/sup tts+/ have been measured with a mass spectrometer in the electron energy range from threshold to 180 eV.
Abstract: Relative cross sections for electron-impact ionization of the rare-gas Van der Waals dimers Ar/sub 2/, ArKr, Kr/sub 2/, KrXe, and Xe/sub 2/ have been measured with a mass spectrometer in the electron energy range from threshold to 180 eV. The following appearance potentials for direct ionization from the corresponding neutral dimers have been found: Ar/sub 2//sup ts+/: 15.2 +- 0.2 eV, ArKr/sup +/: 14.0 +- 0.2 eV, Kr/sub 2//sup ts+/: 13.45 +- 0.3 eV, KrXe/sup +/: 12.2 +- 0.2 eV, and Xe/sub 2//sup ts+/: 11.75 +- 0.3 eV. These values agree with those obtained in recent photoelectron studies. The appearance potential of Ar/sub 2//sup ts+/ formation via associative ionization of argon atoms is found to be 14.6 +- 0.2 eV.
46 citations
TL;DR: A simple construction which allows the monitoring of the radial dependence of the extracted and mass identified ion currents in a hollow cathode stationary afterglow apparatus at any time during the afterglows is described.
Abstract: The current paper describes a simple construction which allows the monitoring of the radial dependence of the extracted and mass identified ion currents in a hollow cathode stationary afterglow apparatus at any time during the afterglow. The main feature of the monitoring device is a fully bakeable and moveable vacuum seal between polished stainless steel and polished Al2O3 ceramic.
1 citations