H F Beyer
Articles written in Pramana – Journal of Physics
Volume 76 Issue 2 February 2011 pp 331-337 Invited Papers
Spectral distribution of the $2S \to 1S$ two-photon transition in atoms and few-electron ions
Ajay Kumar S Trotsenko A V Volotka D Banaś H F Beyer H Bräuning S Fritzsche A Gumberidze S Hagmann S Hess C Kozhuharov R Reuschl U Spillmann M Trassinelli G Weber Th Stöhlker
The two-photon decay of the $2S$ state to the ground state in dressed atoms and oneor two-electron ions has been studied for several decades. Relativistic calculations have shown an 𝑍-dependence of the spectral shape of this two-photon transition in one- or two-electron ions. We have measured the spectral distribution of the $1s2s {}^1 S_0 \to 1_s {}^2 {}^1 S_0$ two-photon transition in He-like tin at the ESR storage ring using a new approach for such experiments. In this method, relativistic collisions of initially Li-like projectiles with a gaseous target were used to populate exclusively the first excited state, $1_s2_s$, of He-like tin, which provided a clean two-photon spectrum. The measured two-photon spectral distribution was compared with fully relativistic calculations. The obtained results show very good agreement with the calculations for He-like tin
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