Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.10: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Z-scaling of M1-transition wavelengths near level crossings for identification of α-sensitive lines in highly charged ions — •Sebastian Kaul1, Alexander Windberger1, Oscar O. Versolato1, Hendrik Bekker1, Victor Bock1, Natalia Oreshkina1, Christoph H. Keitel1, Zoltan Harman1,4, Joachim Ullrich1,2, Piet O. Schmidt2,3, and José R. Crespo López - Urrutia1 — 1Max Planck Institute for Nuclear Physics, D-69117 Heidelberg, Germany — 2QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 3Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany — 4Extreme Matter Institute, 64291 Darmstadt, Germany
Optical transitions near level crossings in highly charged ions like Ir17+ are of special interest for the search of a possible spatial gradient of the value of α, the fine structure constant due to their high sensitivity to its value. However, wavelength predictions for those transitions are not accurate enough for the application of laser spectroscopy. Therefore, we first perform emission spectroscopy in an electron beam ion trap with a grating spectrometer to record spectra between 200 nm and 700 nm with an absolute accuracy of 10−2 nm. In order to identify the observed lines we exploit the Z-scaling laws of the wavelengths of M1 transitions within the isoelectronic sequence Re15+, Os16+, Ir17+, and Pt18+. We also study the electron-density dependence of the signal strength of Ir17+ spectra between 5-80mA to determine relative Einstein coefficients for various lines.