Year: 2011
Type: article
Abstract: We present the first clear identification and highly accurate measurement of the intra-shell transition 1s2p 3 P 2 →1s2s 3 S 1 of He-like uranium performed via x-ray spectroscopy. The present experiment was conducted at the gas-jet target of the ESR storage ring in GSI (Darmstadt, Germany), where a Bragg spectrometer, with a bent germanium crystal, and a Ge(i) detector were mounted. Using the ESR deceleration capabilities, we performed a differential measurement between the 1s2p 3 P 2 →1s2s 3 S 1 He-like U transition energy, at 4510 eV, and the 1s 2 2p 2 P 3/2 →1s 2 2s 2 S 1/2 Li-like U transition energy, at 4460 eV. By a proper choice of the ion velocities, the x-ray energies from the He- and Li-like ions could be measured, in the laboratory frame, at the same photon energy. This allowed for a drastic reduction of experimental systematic uncertainties, principally due to the Doppler effect, and for a comparison with theory without the uncertainties arising from one-photon quantum electrodynamics predictions and nuclear size corrections.
Source: Physica Scripta
Authors: M Trassinelli, A Kumar, H F Beyer, P Indelicato, R Märtin, R Reuschl, Y S Kozhedub, C Brandau, H Bräuning, S Geyer, A Gumberidze, S Hess, P Jagodzinski, C Kozhuharov, D Liesen, U Spillmann, S Trotsenko, G Weber, D F A Winters, Th Stöhlker
Institutions: Centre National de la Recherche Scientifique, Institut des NanoSciences de Paris, Université Pierre-et-Marie-Curie, Bhabha Atomic Research Centre, GSI Helmholtz Centre for Heavy Ion Research, Laboratoire Kastler Brossel, École Normale Supérieure - PSL, Heidelberg University, St Petersburg University, ExtreMe Matter Institute EMMI, Jan Kochanowski University, Helmholtz Institute Jena
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Award: G8654677412
OpenAlex ID: W2003839198