Anisotropic proton emission after fragmentation of H2O by multiply charged ions

P. Sobocinski, Z. D. Pešić, R. Hellhammer, D. Klein, B. Sulik, J. Y. Chesnel, N. Stolterfoht

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Ion-induced fragmentation of H2O molecules was investigated experimentally by 3He2+ impact as a function of the energy in the range from 1 to 5 keV, as well as a function of the charge state of 20 keV 20Neq+ projectiles (q ≤ 3 and 7). The fragments were detected in the angular range from 25° to 135° with respect to the incident beam direction. Particular emphasis is given to protons originating from collisions at large impact parameters involving a Coulomb explosion mechanism. Absolute cross sections dσ/dΩ, differential in the emission angle, are found to be anisotropic. Protons are preferentially emitted at angles near 90°, with cross sections being ∼50% larger than those at forward and backward angles. Possible mechanisms causing anisotropic emission of protons from fragmenting H2O are discussed.

Original languageEnglish
Pages (from-to)927-937
Number of pages11
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume39
Issue number4
DOIs
Publication statusPublished - Feb 21 2006

ASJC Scopus subject areas

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

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