Düsseldorf 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Fachverband Atomphysik
A 15: Atomic Systems in External Fields I
A 15.6: Vortrag
Mittwoch, 21. März 2007, 12:45–13:00, 5M
The two–photon decay of the aligned hydrogen–like U91+ ions — •Lesya Borowska1,2, Andrey Surzhykov3, Thomas Stöhlker4, and Stephan Fritzsche1 — 1Universität Kassel, Kassel, Germany — 2Institute for Nuclear Research, Kyiv, Ukraine — 3MPI, Heidelberg, Germany — 4GSI, Darmstadt, Germany
Within the last decade, experiments with highly charged ions are related to the studies of one– or few–electron systems in the strong electromagnetic fields produced by heavy nuclei. In atomic structure studies, the heavy ions provides us with the unique possibility to test quantum electrodynamics. One of the most sensitive probe of quantum electrodynamical and relativistic effects in strong fields is the two–photon decay of the highly charged hydrogen–like ions [1]. Up to the present the initially excited state of these ions was assumed to be unaligned in all previous studies on the angular correlation of the two emitted photons. In most experiments this assumption is not well justified since the excited states of the ions are produced more often than not in relativistic ion–atom and ion–electron collisions with a well–defined direction of the incoming ion beam [2]. We present theoretical study of the two–photon decay of the aligned hydrogen–like U91+ ions. For these ions we calculated photon–photon angular correlation of the 3d5/2 → 1s1/2 two–photon decay. We compare our result with unaligned case.
[1] S. Fritzsche, P. Indelicato and T. Stöhlker, J. Phys. B38, S707 (2005).
[2] Th. Stöhlker et al, Phys. Scr. T110, 384 (2004).