Photoionization of tungsten ions: experiment and theory for $${{\rm{W}}}^{4+}$$
Abstract
Experimental and theoretical results are reported for single-photon single ionization of the tungsten ion $${{\rm{W}}}^{4+}$$. Absolute cross sections have been measured employing the photon-ion merged-beams setup at the Advanced Light Source in Berkeley. Detailed photon-energy scans were performed at 200 meV bandwidth in the 40–105 eV range. Theoretical results have been obtained from a Dirac-Coulomb R-matrix approach employing basis sets of 730 levels for the photoionization of $${{\rm{W}}}^{4+}$$. Calculations were carried out for the $$4{f}^{14}5{s}^{2}5{p}^{6}5{d}^{2}{}^{3}{{\rm{F}}}_{J}$$, J = 2, ground level and the associated fine-structure levels with J = 3 and 4 for the $${{\rm{W}}}^{4+}$$ ions. In addition, cross sections have been calculated for the metastable levels $$4{f}^{14}5{s}^{2}5{p}^{6}5{d}^{2}{}^{3}{{\rm{P}}}_{0,1,2},{}_{}{}^{1}{\rm{D}}_{2}^{},{}_{}{}^{1}{\rm{G}}_{4}^{},{}_{}{}^{1}{\rm{S}}_{0}^{}$$. In conclusion, a very satisfying agreement of theory and experiment is found for the photoionization cross section of $${{\rm{W}}}^{4+}$$ which is remarkable given the complexity of the electronic structure of tungsten ions in low charge states.
- Authors:
-
[1];
[1];
- Justus-Liebig-Univ. GieBen, Giessen (Germany)
- Justus-Liebig-Univ. GieBen, Giessen (Germany); Univ. of Nevada, Reno, NV (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Nevada, Reno, NV (United States)
- Queen's Univ. Belfast, Belfast (United Kingdom); Harvard Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- 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:
- 1379795
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. B, Atomic, Molecular and Optical Physics
- Additional Journal Information:
- Journal Volume: 50; Journal Issue: 8; Journal ID: ISSN 0953-4075
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; photoionization; tungsten ions; valence shells; absolute cross sections; photon-ion merged-beams techniques; synchrotron radiation; many-electron atoms
Citation Formats
Muller, Alfred, Schippers, S., Hellhund, J., Kilcoyne, A. L. D., Phaneuf, R. A., and McLaughlin, B. M. Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{4+}$. United States: N. p., 2017.
Web. doi:10.1088/1361-6455/aa65df.
Muller, Alfred, Schippers, S., Hellhund, J., Kilcoyne, A. L. D., Phaneuf, R. A., & McLaughlin, B. M. Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{4+}$. United States. https://doi.org/10.1088/1361-6455/aa65df
Muller, Alfred, Schippers, S., Hellhund, J., Kilcoyne, A. L. D., Phaneuf, R. A., and McLaughlin, B. M. Mon .
"Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{4+}$". United States. https://doi.org/10.1088/1361-6455/aa65df. https://www.osti.gov/servlets/purl/1379795.
@article{osti_1379795,
title = {Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{4+}$},
author = {Muller, Alfred and Schippers, S. and Hellhund, J. and Kilcoyne, A. L. D. and Phaneuf, R. A. and McLaughlin, B. M.},
abstractNote = {Experimental and theoretical results are reported for single-photon single ionization of the tungsten ion ${{\rm{W}}}^{4+}$. Absolute cross sections have been measured employing the photon-ion merged-beams setup at the Advanced Light Source in Berkeley. Detailed photon-energy scans were performed at 200 meV bandwidth in the 40–105 eV range. Theoretical results have been obtained from a Dirac-Coulomb R-matrix approach employing basis sets of 730 levels for the photoionization of ${{\rm{W}}}^{4+}$. Calculations were carried out for the $4{f}^{14}5{s}^{2}5{p}^{6}5{d}^{2}{}^{3}{{\rm{F}}}_{J}$, J = 2, ground level and the associated fine-structure levels with J = 3 and 4 for the ${{\rm{W}}}^{4+}$ ions. In addition, cross sections have been calculated for the metastable levels $4{f}^{14}5{s}^{2}5{p}^{6}5{d}^{2}{}^{3}{{\rm{P}}}_{0,1,2},{}_{}{}^{1}{\rm{D}}_{2}^{},{}_{}{}^{1}{\rm{G}}_{4}^{},{}_{}{}^{1}{\rm{S}}_{0}^{}$. In conclusion, a very satisfying agreement of theory and experiment is found for the photoionization cross section of ${{\rm{W}}}^{4+}$ which is remarkable given the complexity of the electronic structure of tungsten ions in low charge states.},
doi = {10.1088/1361-6455/aa65df},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
number = 8,
volume = 50,
place = {United States},
year = {Mon Apr 03 00:00:00 EDT 2017},
month = {Mon Apr 03 00:00:00 EDT 2017}
}
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