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Absolute Photoionization Cross Section Measurements of O II Ions from 29.7 to 46.2 eV

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/44605

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Title: Absolute Photoionization Cross Section Measurements of O II Ions from 29.7 to 46.2 eV
Creators: Nahar, Sultana Nurun; Aguilar, A.; Covington, A. M.; Hinojosa, G.; Phaneuf, R. A.; Alvarez, I.; Cisneros, C.; Bozek, J. D.; Dominguez, I.; Sant'Anna, M. M.; Schlachter, A. S.; McLaughlin, B. M.
Keywords: atomic data
methods -- laboratory
atomic processes
Issue Date: 2003-06
Citation: Aguilar, A., Covington, A. M., Hinojosa, G., Phaneuf, R. A., Alvarez, I., Cisneros, C., Bozek, J. D., Dominguez, I., Sant'Anna, M. M., Schlachter, A. S., Nahar, Sultana Nurun, McLaughlin, B. M. "Absolute Photoionization Cross Section Measurements of O II Ions from 29.7 to 46.2 eV," The Astrophysical Journal Supplement Series, v146, n2, (June, 2003), pp. 467-477.
DOI: 10.1086/368077
Abstract: Absolute photoionization cross sections have been measured for a mixture of ground-state and metastable O II (O^+) ions at photon energies ranging from 29.9 to 46.0 eV (414.7 to 269.5 Å). All measurements were performed by merging an O^+ beam with synchrotron radiation from an undulator beam line at the Advanced Light Source (ALS). At a resolution of 17 meV, more than 70 spectral features have been resolved, most of them identified and characterized. These measurements are compared with two independent R-matrix calculations and the data in TOPbase. All three calculations agree within 25% on the direct photoionization cross section, and with the absolute measurements within 40%. Some differences are noted in the predicted resonance positions among the three close-coupling R-matrix calculations, the TOPbase data being the least accurate. The estimated total experimental uncertainty varies from 15% to 20%. Such measurements benchmark theoretical photoionization cross section calculations performed within the framework of the Opacity Project and the Iron Project.
Description: Relevant data is available at: http://www.astronomy.ohio-state.edu/~nahar/nahar_radiativeatomicdata/index.html
ISSN: 0067-0049
URI: http://hdl.handle.net/1811/44605
Rights: © 2003. The American Astronomical Society. All rights reserved.
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