Total and state selective nl-electron capture cross sections are presented for highly charged ions Z=4-10, 14, 18, and 26 colliding with water molecules. The energy range investigated was from 10 eV/amu (v=0.02 a.u.) to 100 keV/amu (v=2 a.u.). An initialization for the 1B1 and 3A1 orbitals of the water molecule is introduced based on the one center expansion of Moccia and compared to our previous studies based on a hydrogenic approximation within the microcanonical ensemble. The Z dependence of the calculated total cross sections is in reasonable agreement with the recent data of Mawhorter et al. [Phys. Rev. A 75, 032704 (2007)] and is improved over previous results. The energy dependence of the n- and l-level populations is investigated. The K-shell x-ray emission cross sections are determined by using the calculated state-selective electron capture results as input and then applying hydrogenic branching and cascading values for the photon emission. Our results compare favorably with experimental data from the KVI-Groningen, Jet Propulsion Laboratory and Lawrence Livermore National Laboratory groups.
S. Otranto and R. E. Olson, "Charge Exchange and X-Ray Emission Cross Sections for Multiply Charged Ions Colliding with H₂O," Physical Review A, American Physical Society (APS), Feb 2008.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.77.022709
National Agency for the Promotion of Science and Technology (Argentina)
United States. Department of Energy
Keywords and Phrases
X-Ray Emission Spectra; Electron Capture; Ion-Molecule Collisions; Positive Ions; Oxygen; Water
Article - Journal
© 2008 American Physical Society (APS), All rights reserved.