Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 8: Poster HU 1
A 8.10: Poster
Samstag, 5. März 2005, 08:30–18:30, Poster HU
High precision measurements of QED-sensitive forbidden transitions in HCI — •R. Soria Orts1, J. R. Crespo López-Urrutia1, J. Braun1, G. Brenner1, H. Bruhns1, A. J. González Martínez1, A. Lapierre1, V. Mironov1, V. Shabaev2, H. Tawara1, I. Tupitsyn2, and J. Ullrich1 — 1Max Planck Institute for Nuclear Physics — 2St. Petersburg State University, St. Petersburg, Russia
An experimental study of the visible magnetic dipole (M1) transitions in the B- and Be-like argon ions (Ar XIV, Ar XV) using an EBIT has been recently carried out. Their wavelengths were determined with for highly charged ions unprecedented accuracy up to the sub-ppm level and compared with predictions. The QED contributions calculated in this work are four orders of magnitude larger than the experimental error. The Zeeman splitting of these transitions has also been resolved. The transition probability was measured with an error smaller than 0.2% in the case of the Ar13+ 2s22p1 2P1/2-2P3/2 transition, where the QED contribution modifies the lifetime by roughly 1%. Thus these results allow to benchmark theoretical models used to predict both the energy levels (in the present work configuration interaction Dirac-Fock, CIDF) and the transition matrix elements under inclusion of QED. Ultimately, the techniques developed in these experiments will be applied to the study of the hyperfine ground state transitions in hydrogenic heavy ions and isotopic shifts.