Photoionization of tungsten ions: experiment and theory for W^5+
release_rev_40897c59-aae3-4ebc-923b-5969670cd95f
by
A Müller, S Schippers, J Hellhund, A L D Kilcoyne, R A Phaneuf, B
M McLaughlin
2019
Abstract
Experimental and theoretical cross sections are reported for single-photon
single ionization of W^5+ ions. Absolute measurements were conducted
employing the photon-ion merged-beams technique. Detailed photon-energy scans
were performed at (67±10) meV resolution in the 20 – 160 eV range. In
contrast to photoionization of tungsten ions in lower charge states, the cross
section is dominated by narrow, densely-spaced resonances. Theoretical results
were obtained from a Dirac-Coulomb R-matrix approach employing a basis set of
457 levels providing cross sections for photoionization of W^5+ ions in the
4f^145s^2 5p^6 5d ^2 D_3/2 ground level as well as the
4f^145s^2 5p^6 5d ^2 D_5/2 and 4f^145s^2 5p^6 6s ^2
S_1/2 metastable excited levels. Considering the complexity of the
electronic structure of tungsten ions in low charge states, the agreement
between theory and experiment is satisfactory.
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1907.12969v2
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