Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{4+}$

Muller, Alfred; Schippers, S.; Hellhund, J.; Kilcoyne, A. L. D.; Phaneuf, R. A.; McLaughlin, B. M.

doi:10.1088/1361-6455/aa65df

Title: Photoionization of tungsten ions: experiment and theory for $${{\rm{W}}}^{4+}$$

Journal Article · Mon Apr 03 00:00:00 EDT 2017 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI:https://doi.org/10.1088/1361-6455/aa65df· OSTI ID:1379795

^[1];

^[1]; Hellhund, J. ^[2]; Kilcoyne, A. L. D. ^[3]; Phaneuf, R. A. ^[4]; McLaughlin, B. M. ^[5]

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)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379795

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 50, Issue 8; ISSN 0953-4075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Photoionization of tungsten ions: experiment and theory for $${{\rm{W}}}^{4+}$$

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