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A: Atomphysik

A 5: Atome in
äusseren Feldern

A 5.2: Talk

Monday, March 24, 2003, 14:15–14:30, F128

Planar helium under periodic driving — •Madronero Javier and Buchleitner Andreas — Max-Planck-Institut fuer Physik komplexer Systeme

We report the first Floquet spectra of electromagnetically driven planar helium. 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)