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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. Schmidt^2,3, 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.