Optical spectroscopy of complex open-4d-shell ions Sn7+–Sn10+

Publication date
DOI http://dx.doi.org/10.1103/PhysRevA.95.042503
Reference F. Torretti, A. Windberger, A. Ryabtsev, S. Dobrodey, H. Bekker, W. Ubachs, R. Hoekstra, E.V. Kahl, J.C. Berengut, J.R. Crespo López-Urrutia and O.O. Versolato, Optical spectroscopy of complex open-4d-shell ions Sn7+–Sn10+, Phys. Rev. A 95, 042503: 1-16 (2017)
Group EUV Plasma Processes

We analyze the complex level structure of ions with many-valence-electron open-[Kr] 4*d*m subshells (m=7–4) with *ab initio* calculations based on configuration-interaction many-body perturbation theory (CI+MBPT). Charge-state-resolved optical and extreme ultraviolet (EUV) spectra of Sn7+–Sn10+ ions were obtained using an electron beam ion trap. Semiempirical spectral fits carried out with the orthogonal parameters technique and cowan code calculations lead to 90 identifications of magnetic-dipole transitions and the determination of 79 energy ground-configuration levels, questioning some earlier EUV-line assignments. Our results confirm the ab initio predictive power of CI+MBPT calculations for these complex electronic systems.