Effect of electrons of the multiply charged ion core on single-electron capture

Russian Academy of Sciences, Moskva, Moscow, Russia
Technical Physics (Impact Factor: 0.52). 07/2005; 50(8):987-992. DOI: 10.1134/1.2014527

ABSTRACT The population of various electronic states of particles that arise during the capture of a single electron in hydrogen and
helium atoms, as well as hydrogen molecules, by Ar3+ and Ne3+ ions with an energy of several kiloelectronvolts was studied by collision spectroscopy, viz., precision analysis of kinetic
energy variation for ions formed as a result of interaction between ions and atoms. It is shown that single-electron capture
in many cases is a multielectron process accompanied by the rearrangement of a multiply charged ion core. It is found that
the triply charged Ne3+ ions formed as a result of ionization of Ne atoms by electron impacts are formed mainly in metastable states. The population
of excited states of particles during their multiple ionization should be taken into account in determining the characteristics
of various particles by the appearance potential method. Collision spectroscopy can be used for analyzing the metastable ion
impurities in ionic beams.

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    ABSTRACT: Single electron capture from molecular uracil (C4H4N2O2) by doubly-charged He2+, C2+, and O2+ atomic ions followed by the fragmentation of uracil ions has been studied using time-of-flight mass-spectrometry at the collision velocity range 0.13–0.65 a.u. The uracil ion fragmentation mechanism has been clarified by the arrival time correlation analysis for all ion-fragments produced in a single collision. Electron capture with ionization cross section has been determined from experiment. As shown, single electron capture in reaction of uracil with C2+ leads to high fragmentation probability of the resulting uracil ion. The role of electron core rearrangement in the C2+ and O2+ atomic ions is discussed.
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