Single-photon single ionization of W+ ions: experiment and theory
Abstract
Experimental and theoretical results are reported for photoionization of Ta-like (W+) tungsten ions. Absolute cross sections were measured in the energy range 16-245 eV employing the photon-ion merged-beam setup at the advanced light source in Berkeley. Detailed photon-energy scans at 100 meV bandwidth were performed in the 16-108 eV range. In addition, the cross section was scanned at 50 meV resolution in regions where fine resonance structures could be observed. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach. Photoionization cross section calculations were performed for singly ionized atomic tungsten ions in their J = 1/2, ground level and the associated excited metastable levels with J = 3/2, 5/2, 7/2 and 9/2. Since the ion beams used in the experiments must be expected to contain long-lived excited states also from excited configurations, additional cross-section calculations were performed for the second-lowest term, J = 5/2, and for the 4 F term, with J = 3/2, 5/2, 7/2 and 9/2. Given the complexity of the electronic structure of W + the calculations reproduce the main features of the experimental cross section quite well.
- Authors:
-
- Justus-Liebig-Univ. Giessen (Germany)
- Justus-Liebig-Univ. Giessen (Germany); Univ. of Nevada, Reno, NV (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Auburn Univ., AL (United States); Queen's Univ., Belfast, Northern Ireland (United Kingdom)
- Harvard Smithsonian Center for Astrophysics, Cambridge, MA (United States); Queen's Univ., Belfast, Northern Ireland (United Kingdom)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1378585
- Alternate Identifier(s):
- OSTI ID: 1238946
- Grant/Contract Number:
- AC02-05CH11231; AC03-76SF-00098; FG02-76SF-03ER15424
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. B, Atomic, Molecular and Optical Physics
- Additional Journal Information:
- Journal Volume: 48; Journal Issue: 23; Journal ID: ISSN 0953-4075
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Müller, A., Schippers, S., Hellhund, J., Holste, K., Kilcoyne, A. L. D., Phaneuf, R. A., Ballance, C. P., and McLaughlin, B. M. Single-photon single ionization of W+ ions: experiment and theory. United States: N. p., 2015.
Web. doi:10.1088/0953-4075/48/23/235203.
Müller, A., Schippers, S., Hellhund, J., Holste, K., Kilcoyne, A. L. D., Phaneuf, R. A., Ballance, C. P., & McLaughlin, B. M. Single-photon single ionization of W+ ions: experiment and theory. United States. https://doi.org/10.1088/0953-4075/48/23/235203
Müller, A., Schippers, S., Hellhund, J., Holste, K., Kilcoyne, A. L. D., Phaneuf, R. A., Ballance, C. P., and McLaughlin, B. M. Thu .
"Single-photon single ionization of W+ ions: experiment and theory". United States. https://doi.org/10.1088/0953-4075/48/23/235203. https://www.osti.gov/servlets/purl/1378585.
@article{osti_1378585,
title = {Single-photon single ionization of W+ ions: experiment and theory},
author = {Müller, A. and Schippers, S. and Hellhund, J. and Holste, K. and Kilcoyne, A. L. D. and Phaneuf, R. A. and Ballance, C. P. and McLaughlin, B. M.},
abstractNote = {Experimental and theoretical results are reported for photoionization of Ta-like (W+) tungsten ions. Absolute cross sections were measured in the energy range 16-245 eV employing the photon-ion merged-beam setup at the advanced light source in Berkeley. Detailed photon-energy scans at 100 meV bandwidth were performed in the 16-108 eV range. In addition, the cross section was scanned at 50 meV resolution in regions where fine resonance structures could be observed. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach. Photoionization cross section calculations were performed for singly ionized atomic tungsten ions in their J = 1/2, ground level and the associated excited metastable levels with J = 3/2, 5/2, 7/2 and 9/2. Since the ion beams used in the experiments must be expected to contain long-lived excited states also from excited configurations, additional cross-section calculations were performed for the second-lowest term, J = 5/2, and for the 4 F term, with J = 3/2, 5/2, 7/2 and 9/2. Given the complexity of the electronic structure of W + the calculations reproduce the main features of the experimental cross section quite well.},
doi = {10.1088/0953-4075/48/23/235203},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
number = 23,
volume = 48,
place = {United States},
year = {Thu Oct 08 00:00:00 EDT 2015},
month = {Thu Oct 08 00:00:00 EDT 2015}
}
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