Photoionization of tungsten ions: experiment and theory for W${}^{5+}$

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$\pm$10)~meV resolution in the 20 -- 160 eV range. In contrast to photoionization of tungsten ions in lower charge states, the cross section is dominated by narrow, densely-spaced resonances. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach employing a basis set of 457 levels providing cross sections for photoionization of W${}^{5+}$ ions in the $4f^{14}5s^{2}5p^{6}5d{}^2{\mathrm{D}}_{3/2}$ ground level as well as the $4f^{14}5s^{2}5p^{6}5d{}^2{\mathrm{D}}_{5/2}$ and $4f^{14}5s^{2}5p^{6}6s{}^2{\mathrm{S}}_{1/2}$ 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.

arXiv comment15 pages, 5 figures, 2 tables. Accepted for publication in J. Phys. B: At. Mol. Opt. Phys. arXiv admin note: text overlap with arXiv:1703.00892

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Cited by in corpus (1)

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