München 2004 – wissenschaftliches Programm

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A: Atomphysik

A 16: Multiphotonionisation I

A 16.6: Vortrag

Donnerstag, 25. März 2004, 15:15–15:30, HS 133

Nondispersive wave packets in the driven 2D helium atom — •Javier Madronero und Andreas Buchleitner — Max-Planck-Institut für Physik komplexer Systeme, Noethnitzer Str. 38, 01187 Dresden

Nondispersive two-electron wave packets are found in the Floquet spectrum of the driven, two dimensional helium atom. Our ab initio quantum treatment combines Floquet theory, complex dilation, and the representation of the Hamiltonian in suitably chosen coordinates [1], without adjustable parameters. It is equally well adapted to treat the excitation and ionization of ground state atoms by optical fields as of doubly excited Rydberg states under radiofrequency driving. The resulting complex-symmetric, sparse banded generalized eigenvalue problem of rather high dimension is solved using advanced techniques of parallel programming, on one of the largest parallel supercomputers, the Hitachi SR8000-F1 at the Leibniz-Rechenzentrum of the Bavarian Academy of Sciences.

[1] L. Hilico et al., Phys. Rev. A 66, 022101 (2002).