Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Poster: Interaction with VUV and X-ray light
A 35.13: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Direct excitation of s-p E1 transitions in Ir17+ — •Alexander Windberger1, Oscar O. Versolato2, Hendrik Bekker1, Sven Bernitt1, Stepan Dobrodey1, Rene Steinbrügge1, Lisa Schmöger2, Joachim Ullrich2, Zoltan Harman1, Natalia Oreshkina1, Christoph Keitel1, Piet O. Schmidt2,3, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Physikalisch-Technische Bundesanstalt, Braunschweig — 3Leibniz Universität, Hannover
Due to its electronic configuration displaying near degeneracies of 4f and 5s levels, the Ir17+ ion offers a quantum system of particular interest for the study of a possible variation of the fine structure constant at the highest sensitivity. It offers transitions in the optical domain that appear to be excellently suited for high-precision metrology. Disentangling its complex structure is beyond current theoretical capabilities, and therefore spectroscopy in the optical and VUV regime using electron impact excitation is a first step toward those goals. We carry out such measurements at 5 ppm (200 ppm) accuracy in the optical (VUV) regime with an electron beam ion trap (EBIT), and complement them with direct excitation of E1 allowed s-p transitions of both ground state configurations using photonic excitation by means of VUV synchrotron radiation. A campaign at BESSY II with FLASH-EBIT will allow for spectroscopy in the relevant 30-100 eV range that will improve accuracy by at least a factor of 10 and identify the ground state transitions. The experimental requirements for fluorescence detection in the VUV range under magnetic trapping conditions will be presented.