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Frankfurt 2006 – scientific programme

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A: Atomphysik

A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern

A 20.6: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Relativistic quantum optics in multiply charged ions — •Henrik G. Hetzheim, Guido R. Mocken, and Christoph H. Keitel — Max-Planck Institut für Kernphysik, Heidelberg, Germany

The interaction of ultra-intense laser fields with highly charged ions via multiphoton coupling [1, 2] is known to be the source of a large variety of quantum phenomena. To analyze these, we start with the generation of the energy eigenstates of Ne9+ by means of an autocorrelation spectral method. Then, employing a split-operator algorithm, we investigate the time resolved population transfer from the ground state to the various excited states during the interaction with a linearly polarized laser field and its dependence on the laser pulse’s length and intensity, as well as on the initial quantum state of the ionic system. The numerical calculations are carried out in the multiphoton regime so that the associated radiation spectrum includes only non-tunneling harmonics [3]. The results are obtained by using the full Dirac equation in 2D, which provides a more precise picture of the occurring multiphoton resonances than other nonrelativistic treatments. The role of relativistic coherence and interference effects will be discussed.

[1] C. H. Keitel, Contemporary Physics, 42, 353–363 (2001).

[2] S. X. Hu and C. H. Keitel, Phys. Rev. A 63, 053402 (2001).

[3] S. X. Hu, A. F. Starace, W. Becker, W. Sandner and D. B. Milošević, J. Phys. B: At. Mol. Opt. Phys. 35, 627–650 (2002).

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