Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.28: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Unconventional rescattering in strong long-wavelength pulses — •Alexander Kästner, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzerstr. 38, D-01187 Dresden, Germany

In recent experiments a low-energy structure (LES) in the photo-electron spectra of atoms and small molecules in strong long-wavelength pulses was observed [1,2]. This effect cannot be reproduced by the strong-field approximation as well as the simple-man theory, which should apply particularly well for long-wavelengths. Classical trajectory calculations can clearly reproduce the experimental data. By means of a phase-space analysis we could identify a class of trajectories which cause the observed LES. For this class electrons are rescattered aside of the ion they were emitted from. In contrast to conventional backscattering the electron can be accelerated or decelerated. This effect is in competition with the drift velocity. The LES emerges when both effects cancel each other over a wide range of tunneling times.

[1] C.I. Blaga et al., Nature Phys. 5, 335 (2009)

[2] W. Quan et al., Phys. Rev. Lett. 103, 093001 (2009)