Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.23: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
A way to access Two-Photon QED Contributions: High precision spectroscopy of 2s 2S1/2 - 2p 2P1/2 Transitions in Heavy Li-Like Ions. — •Davar Feili1, Ph. Bosselmann1, K.-H. Schartner1, P.H. Mokler2, X. Ma2, A.E. Livingston3, F. Folkmann4, and E. Träbert5 — 1I. Physikalisches Institut der Universität Giessen, D- 35392 Giessen, Germany
— 2GSI, D-64291, Darmstadt, Germany — 3University of Notre Dame, Notre Dame, IN46556, USA — 4University of Aarhus,DK-8000, Aarhus, Denmark — 5Institut für Experimentalphysik III, Ruhr Universität Bochum
Wavelengths of the 2s 2S1/2 - 2p 2P1/2 fine structure transition in lithium-like ions in the medium heavy Z range have been measured using beam foil excitation and grazing incidence spectroscopy. The achieved precision of 70 ppm allows for a 0.1% QED test which establishes a new benchmark. It provides sensitivity to two-photon QED contributions, which are newly calculated for the first time [1]. In this way, measurements and calculations of 2s 2S1/2 - 2p 2P1/2 transitions become one of the most stringent tests of strong field QED available to date. Very good agreement between experiment and these newest calculations based on hydrogenic wave functions and applying a strict QED formalism is observed. All accurate published data along the isoelectronic Li-like series for Z >20 are summarized. Their values and their accuracies are compared to the calculations and to the relative QED contributions, respectively. [1] V. A. Yerokhin et.al. Phys. Rev. Lett. 85, 4699 (2000)