Strong anisotropy in the proton emission following fragmentation of H 2O molecules by impact with slow, highly charged Xenon ions

Z. D. Peić, R. Hellhammer, B. Sulik, N. Stolterfoht

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Abstract

We measured the energy and angular distribution of ionic fragments produced by the interaction of 1-220 keV Xe22+ ions with water molecules. The measured distributions strongly depend on the projectile charge state and energy, as seen from the comparison of the results with previously published data for 5 keV He2+, and 2 and 90 keV Ne(3-9)+ ions. A significant forward-backward asymmetry of the energy and intensity of the H + fragments is observed. The interpretation of the experimental results is guided by means of classical trajectory simulations based on a Coulomb explosion model. The experimental finding of a strong enhancement of the H+ yield at 90° is attributed to an alignment of the molecular axis during the collision and the momentum transfer from the slow projectile.

Original languageEnglish
Article number235202
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume42
Issue number23
DOIs
Publication statusPublished - Dec 3 2009

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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