Journal article

Publication year: 2017

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Volume number: 50

Issue number: 8

ISSN: 0953-4075

eISSN: 1361-6455

Open access status: Green

DOI Link: https://doi.org/10.1088/1361-6455/aa65df

Publisher: IOP Publishing

Abstract: 
Experimental and theoretical results are reported for single-photon single ionization of the tungsten ion W4+. 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 W4+. Calculations were carried out for the 4f(14) 5s(2) 5p(6) 5d(2) F-3(J,) J = 2, ground level and the associated fine-structure levels with J = 3 and 4 for the W4+ ions. In addition, cross sections have been calculated for the metastable levels 4f(14) 5s(2) 5p(6) 5d(2) P-3(0,1,2),D-1(2),(1)G(4),S-1(0). A very satisfying agreement of theory and experiment is found for the photoionization cross section of W4+ which is remarkable given the complexity of the electronic structure of tungsten ions in low charge states.

Harvard Citation style: Müller, A., Schippers, S., Hellhund, J., Kilcoyne, A., Phaneuf, R. and McLaughlin, B. (2017) Photoionization of tungsten ions: experiment and theory for W4+, Journal of Physics B: Atomic, Molecular and Optical Physics, 50(8), Article 085007. https://doi.org/10.1088/1361-6455/aa65df

APA Citation style: Müller, A., Schippers, S., Hellhund, J., Kilcoyne, A., Phaneuf, R., & McLaughlin, B. (2017). Photoionization of tungsten ions: experiment and theory for W4+. Journal of Physics B: Atomic, Molecular and Optical Physics. 50(8), Article 085007. https://doi.org/10.1088/1361-6455/aa65df