Journal article

Publication year: 2016

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

Volume number: 49

Issue number: 6

ISSN: 0953-4075

eISSN: 1361-6455

Open access status: Green

DOI Link: https://doi.org/10.1088/0953-4075/49/6/065201

Publisher: IOP Publishing

Abstract: 
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 5s(2)5p(6)5d(4) D-5(J) = 0, 1, 2, 3, 4 for W2+ and 5s(2)5p(6)5d(3) F-4(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 W3+ ions. However, for W2+ ions at higher energies there is a factor of approximately two difference between experimental and theoretical cross sections.

Harvard Citation style: McLaughlin, B., Ballance, C., Schippers, S., Hellhund, J., Kilcoyne, A., Phaneuf, R., et al. (2016) Photoionization of tungsten ions: experiment and theory for W²⁺ and W³⁺, Journal of Physics B: Atomic, Molecular and Optical Physics, 49(6), Article 065201. https://doi.org/10.1088/0953-4075/49/6/065201

APA Citation style: McLaughlin, B., Ballance, C., Schippers, S., Hellhund, J., Kilcoyne, A., Phaneuf, R., & Mueller, A. (2016). Photoionization of tungsten ions: experiment and theory for W²⁺ and W³⁺. Journal of Physics B: Atomic, Molecular and Optical Physics. 49(6), Article 065201. https://doi.org/10.1088/0953-4075/49/6/065201