Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 37: Precision Spectroscopy of Atoms and Ions VII
A 37.6: Vortrag
Freitag, 6. März 2009, 15:45–16:00, VMP 6 HS-B
Experimental study of two-photon decay in He-like tin — •Sergiy Trotsenko1,2, Ajay Kumar2, Andrey Volotka3, Dariusz Banas4, Heinrich Beyer2, Harald Bräuning2, Alexandre Gumberidze5, Siegbert Hagmann1,2, Sebastian Hess1,2, Christophor Kozhuharov2, Regina Reuschl1,2, Uwe Spillmann1,2, Martino Trassinelli2,5, Günter Weber2,6, and Thomas Stöhlker2,6 — 1IKF, University of Frankfurt, Germany — 2GSI, Darmstadt, Germany — 3TU Dresden, Germany — 4Swietokrzyska Academy, Kielce, Poland — 5Institut des NanoSciences de Paris, France — 6University of Heidelberg, Germany
The study of two-photon transitions (2E1) in the He-like heavy ions is of particular interest due to the sensitivity of its spectral shape to electron correlation and quantum electrodynamical effects. Numerous experimental and theoretical attempts to explore the process have been done in the past proving the high interest and importance of this rare decay mode. In the present investigation an alternative approach for studying the two-photon transitions in few-electron high-Z ions was applied. Here, relativistic collisions of the Li-like projectiles with a gaseous target were used to form the desired initial state allowing to measure the undistorted two-photon spectral shape. The decay of the [1s2s] singlet state in He-like tin (Z=50) was examined and the continuum shape of the two-photon energy distribution was compared with fully relativistic spectral distributions, which in turn are predicted to be Z-dependent. The technique has allowed to confirm for the first time fully relativistic calculations.