Photoionization of Rb2+ ions in the valence energy region 37–44 eV

McLaughlin, Brendan M.; Babb, James F.

doi:10.1088/1361-6455/ab1e99

Title: Photoionization of Rb²⁺ ions in the valence energy region 37–44 eV

Journal Article · Tue May 28 00:00:00 EDT 2019 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI:https://doi.org/10.1088/1361-6455/ab1e99· OSTI ID:1526968

^[1];

^[2]

Queen's Univ., Belfast, Northern Ireland (United Kingdom); Harvard & Smithsonian, Cambridge, MA (United States)
Harvard & Smithsonian, Cambridge, MA (United States)

Absolute photoionization cross sections for the Rb2+ ion were recently measured at high resolution over the energy range 37.31–44.08 eV, with autoionizing Rydberg resonance series identified, using the photon-ion merged-beam setup at the Advanced Light Source (als) in Berkeley (Macaluso D A et al 2016 J. Phys. B: At. Mol. Opt. Phys. 49, 235002; 2017 50, 119501). Detailed photon-energy scans taken at 13.5 ± 2.5 meV bandwidth illustrated multiple Rydberg resonance series associated with the ground and metastable states. Here we present theoretical cross section results obtained using the Dirac–Coulomb R-matrix approximation with a detailed analysis of the resonances. The calculations were performed for the $$3{d}^{10}4{s}^{2}4{p}^{5}{}^{2}{{{\rm{P}}}^{{\rm{o}}}}_{J}$$, $$J=\tfrac{3}{2}$$ ground state and the corresponding $$3{d}^{10}4{s}^{2}4{p}^{5}{}^{2}{{{\rm{P}}}^{{\rm{o}}}}_{J},J=\tfrac{1}{2}$$ metastable level. Finally, results from the large-scale calculations are benchmarked against the als high-resolution measurements and reproduce the dominant resonance features in the spectra, providing confidence in the theoretical work for astrophysical applications.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1526968

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 52, Issue 12; ISSN 0953-4075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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