Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Interaction with strong or short laser pulses I
A 24.3: Vortrag
Mittwoch, 2. März 2016, 11:30–11:45, f303
Photoionization of hydrogen-like ions by twisted attosecond light pulses — •Robert A. Müller1,2, Daniel Seipt2, Stephan Fritzsche1,2, and Andrey Surzhykov2 — 1Friedrich-Schiller-University Jena, Germany — 2Helmholtz-Institute Jena, Germany
In the recent years a number of theoretical studies has been attributed to the interaction between atomic systems and twisted light. It has been found for instance that if an atom is ionized by twisted light, the emission pattern of the photoelectrons remarkably depends on the so called impact parameter which is the distance between the target atom and the beam axis [1]. This sensitivity is caused by the spatial inhomogeneity of vortex light beams, which have intensity maxima lying on concentric rings. The loci of these rings depend on the frequency of the twisted light. This frequency has been assumed to be monochromatic in all former studies. Nowadays however it is possible to create twisted pulses in the attosecond regime [2]. Naturally these pulses are not monochromatic but have a frequency distribution. Therefore the beam profiles of the pulses become frequency dependent. In this contribution we discuss how this dependency affects the photoionization of atoms by twisted light. We will present calculations for the angular distribution and the spectrum of the emitted photoelectrons depending on both the impact parameter and the pulse duration which limits the width of the frequency distribution.
[1] Matula et al., J. Phys. B 46, 205002 (2013)
[2] Géneaux et al., arXiv:1509.07396 (2015)