Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..dmp.t1073e&link_type=abstract
American Physical Society, 41st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics Volume 55, Number 5,
Physics
Scientific paper
The determination of elemental abundances in astrophysical nebulae is highly dependent on the accuracy of atomic data. Absolute single photoionization cross sections for Se^+, Se^2+, Se^3+, Se^5+, Xe^+ and Xe^2+ have been measured at the ALS at Lawrence Berkeley National Laboratory using the merged-beams technique. All ions except Se^5+ were measured from the metastable region to at least 10 eV above the direct ionization threshold. Theoretical calculations for Se^5+ indicated strong resonances above 100 eV would dominate, therefore this region was explored for this ion. Rydberg series are identified for each ion and the experimental results are compared to theoretical photoionization cross section calculations using fully relativistic Dirac R-matrix code (DARC). This research was supported by both the DOE and NASA.
Aguilar Alex
Alna'Washi Ghassan
Ballance Connor
Bilodeau Rene
David Kilcoyne A. L.
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