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A: Atomphysik
A 16: Multiphotonionisation I
A 16.5: Vortrag
Donnerstag, 25. März 2004, 15:00–15:15, HS 133
Electron-electron dynamics in laser-induced nonsequential ionization — •C. Figueira de Morisson Faria1, X. Liu2, H. Schomerus3, and W. Becker2 — 1Institut für theoretische Physik, Universität Hannover, Appelstr. 2, 30167 Hannover — 2Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin — 3Max-Planck Institut für Physik komplexer Systeme, Nöthnizer Str. 38, 01187 Dresden
We address laser-induced nonsequential double ionization (NSDI) by linearly polarized fields, considering rescattering impact ionization within the strong-field and uniform approximations. More specifically, we analyze the footprints of the interaction by which the returning electron frees the bound electron. We adopt either a (three-body) contact interaction or a Coulomb interaction, and we do or do not incorporate the mutual Coulomb repulsion of the two electrons in their final state. In particular, we investigate the correlation of the electron momentum components parallel to the laser-field polarization, with the transverse momentum components either restricted to certain finite ranges or entirely summed over. We show that the type of electron-electron interaction mainly influences the yields for small transverse momenta of both electrons. Thus, experiments in this regime should be particularly promising in the elucidation of the dynamics of NSDI. Moreover, a classical approximation of the quantum-mechanical S-matrix is formulated and shown to work very well inside the classically allowed region.
(physics/03012052)