Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Poster: Interaction with VUV and X-ray light
A 24.2: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
Two-photon absorption of few-electron heavy ions — Andrey Surzhykov1,2, Paul Indelicato3, Jose-Paulo Santos4, Pedro Amaro4, and •Stephan Fritzsche2,5 — 1Physikalisches Institut, Universität Heidelberg, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Germany — 3Laboratoire Kastler Brossel, Paris, France — 4Departamento de Física, Universidade Nova de Lisboa, Portugal — 5Department of Physics, University of Oulu, Finland
The two-photon absorption of few-electron ions has been studied theoretically in the framework of second-order perturbation theory and Dirac’s relativistic equation. Expressions were derived especially for the excitation cross sections and rates, including the contribution of higher-order multipoles in the expansion of the electron-photon interaction. Though these expressions are independent of the particular shell structure of the ion, detailed computations have been carried out for the two-photon absorption of hydrogen-, helium-, and berylliumlike ions and are compared with the available
theoretical and experimental data. In this contribution, we discuss the relativistic and nondipole effects upon the induced two-photon transitions as well as the potential for exploring parity-violating interactions in high-Z ions [1].
A. Surzhykov et al., Phys. Rev. A 84 (2011) 022511.