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    • Keywords


      Two-photon decay; ionization; highly-charged ions.

    • Abstract


      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

    • Author Affiliations


      Ajay Kumar1 S Trotsenko2 3 4 A V Volotka5 D Banaś6 H F Beyer2 H Bräuning2 S Fritzsche2 A Gumberidze7 S Hagmann2 4 S Hess2 4 C Kozhuharov2 R Reuschl2 4 U Spillmann2 4 M Trassinelli8 G Weber2 9 Th Stöhlker2 3 9

      1. Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      2. GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
      3. Helmholtz-Institut Jena, D-07743 Jena, Germany
      4. Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany
      5. Institut für Theoretische Physik, Technische Universität, D-01062 Dresden, Germany
      6. Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland
      7. ExtreMe Matter Institute (EMMI), GSI, D-64291 Darmstadt, Germany
      8. Institut des Nanosciences de Paris, Campus Boucicaut, 75015 Paris, France
      9. Physikalisches Institut, Ruprecht-Karls-Universität, D-69120 Heidelberg, Germany
    • Dates

  • Pramana – Journal of Physics | News

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