Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 20: Atoms in Fields
A 20.4: Vortrag
Freitag, 6. April 2001, 16:30–16:45, H1058
Chaotic ionization of non-hydrogenic alkali Rydberg states — •Andreas Krug1,2 and Andreas Buchleitner1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching b. München
We present the first ab initio treatment of microwave driven alkali Rydberg states. We find that nonhydrogenic atomic initial states - with no uniquely defined classical analogon - exhibit fingerprints of classically chaotic motion, and identify the relevant frequency scale that accounts for the experimentally observed [1] considerable discrepancies in the ionization yield of microwave driven alkali Rydberg states as compared to atomic hydrogen.
Our method combines the Floquet theorem, complex dilation of the Hamilton operator, and quantum defect theory. An efficient parallel implementation of our numerical code on the largest supercompter available in the academic realm (HITACHI SR8000-F1 at LRZ Munich) allows for an exact treatment of typical experimental quantum numbers (n≃ 30...80), which define a multiphoton ionization process of the order of 15...120.
[1] P. M. Koch, and K. A. H. Leeuwen, Phys. Rep. 255, 289 (1995).