Year 2024

• Gordon Decomposition of the Magnetizability of a Dirac One-Electron Atom in an Arbitrary Discrete Energy State

  Publication

  • P. Stefańska-Ptaszek (formerly: P. Stefańska)

  - Atoms - Year 2024

  We present analytical derivation of formulas for diamagnetic and paramagnetic contributions to magnetizabilities of relativistic hydrogenlike atoms being in an arbitrary discrete energy eigenstate.

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Year 2023

• Collision Strengths of Astrophysical Interest for Multiply Charged Ions

  Publication

  • S. Fritzsche
  • L. Jiao
  • Y. Wang
  • J. E. Sienkiewicz (formerly: J. Sienkiewicz)

  - Atoms - Year 2023

  The electron impact excitation and ionization processes are crucial for modeling the spectra of different astrophysical objects, from atmospheres of late-type stars to remnants of supernovae and up to the light emission from neutron star mergers, to name just a few. Despite their signifi- cance, however, little is known quantitatively about these processes for low- and medium-impact energies of, say, Ekin . 5000 eV of the free...

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Year 2021

• Binary-Encounter Model for Direct Ionization of Molecules by Positron-Impact

  Publication

  • M. Franz
  • K. Wiciak-Pawłowska
  • J. Franz

  - Atoms - Year 2021

  We introduce two models for the computation of direct ionization cross sections by positron impact over a wide range of collision energies. The models are based on the binary-encounter-Bethe model and take into account an extension of the Wannier theory. The cross sections computed with these models show good agreement with experimental data. The extensions improve the agreement between theory and experiment for collision energies...

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