Photoionization of tungsten ions: experiment and theory for ${{\rm{W}}}^{2+}$ and ${{\rm{W}}}^{3+}$

McLaughlin, B. M.; Ballance, C. P.; Schippers, S.; Hellhund, J.; Kilcoyne, A. L. D.; Phaneuf, R. A.; Müller, A.

doi:10.1088/0953-4075/49/6/065201

Title: Photoionization of tungsten ions: experiment and theory for $${{\rm{W}}}^{2+}$$ and $${{\rm{W}}}^{3+}$$

Journal Article · Mon Feb 22 00:00:00 EST 2016 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI:https://doi.org/10.1088/0953-4075/49/6/065201· OSTI ID:1398396

McLaughlin, B. M.; Ballance, C. P.; Schippers, S.; Hellhund, J.; Kilcoyne, A. L. D.; Phaneuf, R. A.; Müller, A.

Experimental and theoretical results are reported for single-photon single ionization of W²⁺ and W³⁺ tungsten ions. Experiments were performed at the photon-ion merged-beam setup of the Advanced Light Source in Berkeley. Absolute cross sections and detailed energy scans were measured over an energy range 20-90 eV at a bandwidth of 100 meV. Broad peak features with widths typically around 5 eV have been observed with almost no narrow resonances present in the investigated energy range. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach. The calculations were carried out for the lowest-energy terms of the investigated tungsten ions with levels 5s²5p⁶5d⁴ ⁵D_J J = 0, 1, 2, 3, 4 for W²⁺ and 5s²5p⁶5d³ ⁴F_J^' J^' = 3/2, 5/2, 7/2, 9/2 for W³⁺. Assuming a statistically weighted distribution of ions in the initial ground-term levels there is good agreement of theory and experiment for W 3+ ions. However, for W²⁺ ions at higher energies there is a factor of approximately two difference between experimental and theoretical cross sections.

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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; AC05-00OR22725

OSTI ID:: 1398396

Alternate ID(s):: OSTI ID: 1239002

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 49, Issue 6; ISSN 0953-4075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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