A. Gumberidze,
S. Fritzsche,
S. Hagmann,
C. Kozhuharov,
X. Ma,
M. Steck,
A. Surzhykov,
A. Warczak,
and T. Stöhlker
Magnetic-sublevel population and alignment for the excitation of H- and He-like uranium in relativistic collisions
Phys. Rev. A, 84 :042710 (October 2011)
Magnetic-sublevel population and alignment for the excitation of H- and He-like uranium in relativistic collisions
Phys. Rev. A, 84 :042710 (October 2011)
Abstract:
We have measured the alignment of the L-shell magnetic substates following the K-shell excitation of hydrogen- and helium-like uranium in relativistic collisions with a low-Z gaseous target. Within this experiment, the population distribution for the L-shell magnetic sublevels has been obtained via an angular differential study of the decay photons associated with the subsequent deexcitation process. The results show a very distinctive behavior for the H- and He-like heavy systems. In particular, for K → L excitation of He-like uranium, a considerable alignment of the L-shell levels was observed. A comparison of our experimental findings with recent rigorous relativistic predictions provides a good qualitative and a reasonable quantitative agreement, emphasizing the importance of the magnetic-interaction and many-body effects in the strong-field domain of high-Z ions.