4.2 Article

Strong anisotropy in the proton emission following fragmentation of H2O molecules by impact with slow, highly charged Xenon ions

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IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/42/23/235202

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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 degrees is attributed to an alignment of the molecular axis during the collision and the momentum transfer from the slow projectile.

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