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A: Atomphysik

A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern

A 20.3: Poster

Donnerstag, 16. März 2006, 16:30–18:30, Labsaal

The Role of Rescattering in the Multiphoton Detachment of Br⁻ in a Strong Linearly Polarized Laser Field — •Boris Bergues, Hanspeter Helm, and Igor Yu. Kiyan — Department of Optical and Molecular Physics, Universität Freiburg, Stefan-Meier-Str. 19, 79104 Freiburg, Germany.

Negative bromine ions are exposed to strong linearly polarized infrared laser pulses of approximately 100 fs duration with a peak intensity on the order of 10¹³ to 10¹⁴ W/cm². The photodetached electrons are projected onto a 2D position sensitive detector. Taking advantage of the axial symmetry with respect to the polarization axis, the full 3D information is recovered by a back projection algorithm, yielding the angular resolved energy spectrum of the photoelectrons. In our previous experiments using linearly as well as circularly polarized light, we showed that the KFR theory of direct electrons qualitatively describes all the features of the measured potodetachment spectra. The extended KFR theory which takes into account the rescattering of the photodetached electron from its parent core predicts a plateau of hot electrons in the photoelectron spectrum. In the present work, we investigate the role of the rescattering effect for negative bromine ions. This work is supported by the Deutsche Forschungsgemeinschaft, Grant No. KI 865/1-1.