Experimentally established correlation between ion charge state distributions and kinetic ion energy distributions in a direct current vacuum arc discharge
2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 9, 093301- p.Article in journal (Refereed) Published
DC arc plasmas from Al, Ti, Cu, Mo, and W cathodes have been characterized with respect to plasma chemistry and charge-state-resolved ion energy. The evaluated average ionization energies in the plasmas were found to be linearly correlated with the kinetic ion energies. This was further supported by evaluation of previously published data for 42 elements. A comparison of the total ion kinetic energy distribution and the corresponding ion charge state distribution, as defined by the ionization energies of the constituent ions, showed close to equivalent shapes and widths, for all cathodes analyzed. This suggests that the energy provided for ionization and acceleration varies simultaneously during plasma generation in the arc spot. The presented results provide a link between the ionization and acceleration processes, and may provide further insight into the fundamentals of cathode spot evolution and plasma generation. (C) 2015 AIP Publishing LLC.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 117, no 9, 093301- p.
IdentifiersURN: urn:nbn:se:liu:diva-117233DOI: 10.1063/1.4914301ISI: 000351134400005OAI: oai:DiVA.org:liu-117233DiVA: diva2:807100
Funding Agencies|European Research Council under the European Community ; Swedish Research Council (VR) [642-2013-8020]; KAW Fellowship program; Russian Scientific Foundation [14-19-00083]2015-04-222015-04-212015-04-22