Technical Physics Letters
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Anomalous Dissociative Capture Cross Section at the Interaction of Singly Charged Ions with Molecules of Nucleic Acid Bases
Basalaev A. A.1, Kuz’michev V. V.1, Panov M. N.1, Smirnov O. V.1
1Ioffe Institute, St. Petersburg, Russia
Email: a.basalaev@mail.ioffe.ru
The single electron capture process from adenine molecules by H+, 3He+, N+, O+, and Ne+ ions with an energy of 6.3 keV has been studied. It was found that when one electron is captured by He+ and Ne+ ions, the dissociative capture process is dominant, which is fundamentally different from the processes of capture by singly charged ions of atoms with a lower ionization potential and multiply charged ions, as well as from the process of electron impact ionization. This effect is qualitatively explained within the framework of a quasimolecular model. Keywords: dissociative capture, nucleic acid bases, fragmentation, Landau-Zener model.
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