Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 32: Collisions, scattering and correlation phenomena

A 32.1: Hauptvortrag

Donnerstag, 14. März 2019, 14:00–14:30, S HS 3 Physik

Time-resolved dynamics of slow photoelectrons in the rescattering regime — Martin Ranke^1,3, Sophie Walther^1,3, Anastasios Dimitriou^1,3, Mark J. Prandolini¹, Markus Pfau^1,3, Thomas Gebert², Marek Wieland^1,3, Markus Drescher^1,3, and •Ulrike Frühling^1,3 — 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.