Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 32: Collisions, scattering and correlation phenomena
A 32.1: Invited Talk
Thursday, March 14, 2019, 14:00–14:30, S HS 3 Physik
Time-resolved dynamics of slow photoelectrons in the rescattering regime — Martin Ranke1,3, Sophie Walther1,3, Anastasios Dimitriou1,3, Mark J. Prandolini1, Markus Pfau1,3, Thomas Gebert2, Marek Wieland1,3, Markus Drescher1,3, and •Ulrike Frühling1,3 — 1Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Max-Planck-Institut für Struktur und Dynamik der Materie, Luruper Chaussee 149, 22761 Hamburg, Germany — 3The Hamburg Centre for Ultrafast Imaging CUI, Luruper Chaussee 149, 22761 Hamburg, Germany
Acceleration of photoelectrons with intense light fields is an essential process in strong field laser physics. When the momentum change due to the light field acceleration is large, the electrons can be decelerated and scattered from the ionic core. This process is of fundamental importance, for example, in high harmonic generation. Here, we experimentally investigate the dynamics of slow photoelectrons generated by multi-photon ionization of Xe with an infrared (IR) laser pulse using a femtosecond streak camera. The ejected photoelectrons are superimposed with an intense carrier envelope phase stable terahertz (THz) light field strong enough to allow for rescattering. We observed a strong modulation of the photoelectron momentum distribution for different phases between the THz and IR laser fields. The angular momentum distribution is measured using a velocity map imaging (VMI) spectrometer with a novel gas injection design, which provides high target gas densities while preserving its momentum resolution.