Spectral distribution of the 2S →1 S two-photon transition in atoms and few-electron ions
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- KUMAR, A., TROTSENKO, S., VOLOTKA, A.V. et al. Pramana - J Phys (2011) 76: 331. doi:10.1007/s12043-011-0036-0
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The two-photon decay of the 2S state to the ground state in dressed atoms and one- or 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\(^1\!S_0\) → 1s2\(^1\!S_0\) 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, 1s2s, 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.