Darmstadt 2008 – scientific programme

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A: Fachverband Atomphysik

A 12: Posters: Interaction with intense laser pulses

A 12.19: Poster

Tuesday, March 11, 2008, 16:30–18:30, Poster C3

Level shifts of highly charged ions in laser fields — •O. Postavaru, Z. Harman, and C. H. Keitel — Max-Planck-Institut für Kernphysik

We investigate the level structure of heavy hydrogenlike ions in laser beams. In heavy ions, the electrons are tightly bound by the Coulomb potential of the nucleus, which prohibits ionization even by strong lasers. However, interaction with the light field leads to dynamic shifts of the electronic energy levels. We apply a fully relativistic description of the electronic states by means of the Dirac equation. Interaction with the monofrequent laser field is treated by second-order time-dependent perturbation theory. Our formalism goes beyond the Stark dipole approximation and takes into account the non-dipole effects of retardation and interaction with the magnetic field components of the laser beam. The resulting level shifts are relevant for experiments with multiply charged ions at present and near-future laser systems like the FLASH [1] and the PHELIX [2] facilities. [1] S.W. Epp, J.R. Crespo López-Urrutia, G. Brenner et al., Phys. Rev. Lett. 98, 183001 (2007) [2] P. Neumayer, R. Bock, S. Borneis et al., Laser and Particle Beams 23, 385 (2005)