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Water fragmentation by bare and dressed light ions with MeV energies: Fragment-ion-energy and time-of-flight distributions
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 9
2016 (English)In: Physical Review A, ISSN 2469-9926, Vol. 94, no 2, 022712Article in journal (Refereed) Published
Abstract [en]

The energy and time-of-flight distributions of water ionic fragments produced by impact of fast atoms and bare and dressed ions; namely, H+, Li0-3+, C1+, and C2+ are reported in this work. Fragment species as a function of emission energy and time-of-flight were recorded by using an electrostatic spectrometer and a time-of-flight mass spectrometer, respectively. An improved Coulomb explosion model coupled to a classical trajectory Monte Carlo (CTMC) simulation gave the energy centroids of the fragments for the dissociation channels resulting from the removal of two to five electrons from the water molecule. For the energy distribution ranging up to 50 eV, both the experiment and model reveal an isotropic production of multiple charged oxygen ions, as well as hydrogen ions. From the ion energy distribution, relative yields of the dissociation resulting from multiple ionization were obtained as a function of the charge state, as well as for several projectile energies. Multiple-ionization yields with charge state up to 4+, were extracted from the measurements of the time-of-flight spectra, focused on the production of single and multiple charged oxygen ions. The measurements were compared to ion-water collision experiments investigated at the keV energy range available in the literature, revealing differences and similarities in the fragment-ion energy distribution.

Place, publisher, year, edition, pages
2016. Vol. 94, no 2, 022712
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-134417DOI: 10.1103/PhysRevA.94.022712ISI: 000381882800005OAI: oai:DiVA.org:su-134417DiVA: diva2:1039135
Available from: 2016-10-21 Created: 2016-10-06 Last updated: 2016-10-21Bibliographically approved

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Schuch, Reinhold
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