• DOI:10.1088/1361-6455/aa65df
• Corpus ID: 118897108

Photoionization of tungsten ions: experiment and theory for W 4 +

@article{Mller2017PhotoionizationOT,
  title={Photoionization of tungsten ions: experiment and theory for W 4 +},
  author={Alfred M{\"u}ller and Stefan Schippers and Jonas Hellhund and A. L. David Kilcoyne and Ronald A. Phaneuf and Brendan M. McLaughlin},
  journal={Journal of Physics B: Atomic, Molecular and Optical Physics},
  year={2017},
  volume={50}
}

• A. Müller, S. Schippers, +3 authors B. McLaughlin
• Published 2 March 2017
• Physics
• Journal of Physics B: Atomic, Molecular and Optical Physics

Experimental and theoretical results are reported for single-photon single ionization of the tungsten ion 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 W 4 + . Calculations were carried out for the 4 f 14 5 s 2 5 p 6 5 d 2 3 F J , J = 2, ground level and the associated fine-structure levels with J = 3 and 4 for the 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 P 0 , 1 , 2 , D 2 1 , G 4 1 , S 0 1 . A very satisfying agreement of theory and experiment is found for the photoionization cross section of W 4 + which is remarkable given the complexity of the electronic structure of tungsten ions in low charge states.