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A: Atomphysik
A 6: Elektronenstreuung/-rekombination
A 6.8: Vortrag
Dienstag, 5. März 2002, 18:15–18:30, HS 15/E10
The Lyman–α1 decay in hydrogen-like ions: Interference between the E1 and M2 transition amplitudes — •Andrey Surzhykov 1, Stephan Fritzsche1, Thomas Stöhlker2, and Alexandre Gumberidze2 — 1Fachbereich Physik, Universität Gh Kassel, D-34132 Kassel, Germany — 2Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
We report on the interference between the leading electric–dipole (E1) and the – much weaker – magnetic–quadrupole (M2) transitions which occurs in the Lyman–α1 (2p3/2 → 1s1/2) decay in hydrogen–like ions [1]. This interference is found to affect considerably the angular distribution and polarization of the emitted photons. A rather remarkable correction shows up not only for heavy but also for medium–Z elements.
To emphasize the importance of this E1–M2 interference for the
interpretation of experimental results, we consider the
radiative decay following an electron capture into excited levels of
the bare uranium ion. From angular distribution of the Lyman–α1
photons, a significant alignment of the 2p3/2 state was
deduced
experimentally [2] but until now not well reproduced by theory [3].
However, this discrepancy is removed if the interference of the E1 and M2
decay
channels is taken into account. A similar large interference can be
expected also for the properties of
characteristic radiation in the few– (or many–) electron ions.
[1] A. Surzhykov, S. Fritzsche, A. Gumberidze and Th. Stöhlker,
submitted
to Phys. Rev. Lett. (2001).
[2] Th. Stöhlker et al., Phys. Rev. Lett. 79 (1997)
3270.
[3] J. Eichler, A. Ichihara and T. Shirai,
Phys. Rev. A 58 (1998) 2128.