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A: Fachverband Atomphysik

A 10: Precision Spectroscopy of Atoms and Ions I

A 10.5: Talk

Wednesday, March 10, 2010, 11:45–12:00, F 107

Spectral properties of unnatural parity states of two-electron atoms — •Sebastian Schröter¹, Johannes Eiglsperger¹, Bernard Piraux², and Javier Madroñero¹ — ¹Technische Universität München — ²Université catholique de Louvain

In recent years a lot of effort has been invested into the study of the spectral properties of helium states. Most of these studies are devoted to natural parity states (e.g, states that can be accessed through linearly polarized dipole transitions from the ground state). However, there are rather few investigations [1] on unnatural parity states which are in the focus of this contribution. The knowledge of accurate values of such energy levels is important not only in the context of atomic physics but also in various fields like astrophysics (e.g., for the understanding of lines observed in the solar corona) and plasma physics for diagnostics and understanding of high temperature processes. We present a detailed study of the spectral properties of such states in a planar model [2] and in a full three dimensional approach [3] for several angular momenta and for a rather wide energy range which includes bound states (below the second single ionization threshold (SIT)) and resonances up to the eighth SIT.

[1] J. K. Saha and T. K. Mukherjee, Phys. Rev. A 80, 022513 (2009).

[2] J. Eiglsperger and J. Madroñero, Phys. Rev. A 80, 022512 (2009).

[3] J. Eiglsperger, B. Piraux, and J. Madroñero, Phys. Rev. A 80, 022511 (2009).