Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 2: Atomic Systems in External Fields I

A 2.4: Talk

Monday, March 8, 2010, 14:45–15:00, F 107

Polarization transfer in the inner–shell photoionization of sodium–like ions — •Lalita Sharma^1,2, Andrey Surzhykov^1,2, Mokhtar K Inal³, and Stephan Fritzsche^2,4 — ¹Physikalisches Institut der Universität Heidelberg — ²GSI Helmholtzzentrum für Schwerionenforschung GmbH — ³Départment de Physique, Université A. Belkaid, Tlemcen, Algeria — ⁴Department of Physical Sciences, University of Oulu, Finland

Density matrix formalism based on Dirac’s relativistic equation has been applied to study the characteristic emission following the inner–shell photoionization of many–electron ions. In our theoretical analysis, emphasis is placed on the question how the polarization of the incident light affects the polarization of the characteristic radiation. Detailed computations have been carried out, in particular, for two electric dipole 2p⁵ 3s  ¹P₁→ 2p^6  1S₀ and 2p⁵ 3s  ³P₁→ 2p^6  1S₀ as well as one magnetic quadrupole 2p⁵ 3s  ³P₂→ 2p^6  1S₀ transitions following the ionization of the 2p electron from the sodium–like Fe¹⁵⁺ and U⁸¹⁺ ions by linearly polarized light. From these calculations, it is shown that the (degree of) linear polarization of the characteristic radiation may be enhanced by a factor of two due to the polarization transfer from the incident light. In addition to the polarization transfer, higher–order (nondipole) terms in the electron–photon interaction as well as cascade feeding from higher levels are found to have strong influence on the polarization of the subsequently emitted photons.