Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 20: Poster: Precision spectroscopy of atoms and ions (with Q)

A 20.23: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Hyperfine Structure Investigations by Modelling Emission Spectra — •Bettina Gamper and Laurentius Windholz — Institut für Experimentalphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Österreich

We present studies of the spectral lines of Praseodymium by modelling the emission spectrum by a sum of the hyperfine (hf) profiles of all spectral lines in a certain region. Pr has a huge amount of spectral lines, mostly in the visible region. Many transitions have nearly the same center of gravity (cg) wavelength which leads to overlapping of two or more spectral lines. To distinguish the different lines which take part in these so called blend situations we use laser-induced fluorescence (LIF) spectroscopy. We get the excitation wavelength for the investigations of a promising structure from a highly resolved Fourier transform (FT) spectrum. Our goal is to classify as many spectral lines as possible and to discover new energy levels. In the last years our group enlarged the list of the spectral lines from 12000 to 26000 and found about 300 new energy levels of the Pr atom as well as of the Pr ion. With our new program we can now summarize all classified transitions and compare them to the FT spectrum, in order to judge whether all lines contributing to the emission spectrum are known or not. The program can be adapted to every other element. An application of such a modelling could be analyzing highly resolved stellar spectra.