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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 Sharma1,2, Andrey Surzhykov1,2, Mokhtar K Inal3, and Stephan Fritzsche2,41Physikalisches 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→ 2p6  1S0 and 2p5 3s  3P1→ 2p6  1S0 as well as one magnetic quadrupole 2p5 3s  3P2→ 2p6  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.

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