Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 16: XUV/X-ray spectroscopy III

A 16.4: Talk

Tuesday, March 7, 2017, 15:30–15:45, N 2

Optical and EUV spectroscopy of complex open 4d-shell Sn^7+..14+ ions — •Hendrik Bekker¹, Francesco Torretti^{2, 5}, Alexander Windberger^{1, 2}, Alexander Ryabtsev^{3, 4}, Stepan Dobrodey¹, Wim Ubachs^{2, 5}, Ronnie Hoekstra^{2, 6}, Anastasia Borschevsky⁸, Emily V. Kahl⁷, Julian C. Berengut⁷, José R. Crespo López-Urrutia¹, and Oscar O. Versolato² — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²Advanced Research Center for Nanolithography, Amsterdam — ³Institute of Spectroscopy, Russian Academy of Sciences, Troitsk — ⁴EUV Labs, Ltd., Troitsk — ⁵Department of Physics and Astronomy, and LaserLaB, VU, Amsterdam — ⁶Zernike Institute for Advanced Materials, University of Groningen — ⁷School of Physics, University of New South Wales, Sydney — ⁸The Van Swinderen Institute, University of Groningen

We present the analysis of the level structure of Sn^7+..14+ ions with their many-valence-electron open [Kr]4d^m shell (m=7-0). These are essential in bright extreme-ultraviolet (EUV) plasma-light sources for next-generation nanolithography, but their complex electronic structure is an open challenge for both theory and experiment. We combine charge-state-resolved optical and EUV spectroscopy in an electron beam ion trap with state-of-the-art calculations using configuration-interaction many-body perturbation theory. Line identifications were performed employing semi-empirical calculations using the orthogonal parameters technique and cowan code calculations. The results represent the most complete data available to date and suggest that some EUV line identifications in previous work need to be revisited.