Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 33: Poster Session II

A 33.8: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal

Extrapolation of spectral lines of highly charged technetium ions in the EUV range — Leticia Täubert¹, Julia I. Jäger¹, •Chintan Shah¹, Klaus Werner², and José Ramón Crespo López-Urrutia¹ — ¹Max-Plank-Institut für Kernphysik, Heidelberg, Germany — ²Eberhard Karls Universität, Tübingen, Germany

Astronomical observations of elements heavier than iron in stars give insights into their stellar evolution. To interpret spectroscopic observations, accurate atomic data of highly charged trans-iron ions are required. The trans-iron element technetium (Z=43) is of special interest since it is the lightest element with no stable isotopes. The spectroscopic measurement of such element poses a technical challenge due to its radioactive nature. Here, we examined its neighboring elements ruthenium (Z=44) and molybdenum (Z=42) on the premise that their atomic structures are same as of technetium. We produced Ru¹⁴⁺ and Ru¹⁵⁺ using an electron beam ion trap and measured the extreme ultraviolet spectra using flat-field grazing incidence spectrometer. We then identified spectral lines using the Flexible Atomic Code [3]. The NIST spectral line database was used to acquire the corresponding molybdenum spectra. These data enabled the extrapolation of the spectral lines of highly charged technetium.[1] K. Werner et al., ApJL, 753, L7 (2012) [2] K. Werner et al., A&A, 574, A29 (2015) [3] M. Gu, CJP, 86, 5 (2008).