Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Poster Session - Atomic Physics I
A 9.14: Poster
Montag, 9. März 2020, 16:00–18:00, Empore Lichthof
Time-resolved rescattering of slow photoelectrons by single-cycle terahertz radiation — Martin Ranke1,2, Sophie Walther1,2, Anastasios Dimitriou1,2, Markus Pfau1,2, •Mark J. Prandolini1, Thomas Gebert3, Andrey Kazansky4, Nikolay Kabachnik4, Marek Wieland1,2, Markus Drescher1,2, and Ulrike Frühling1,2 — 1Institut für Experimentalphysik, Universität Hamburg, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging (CUI), 22761 Hamburg, Germany — 3Max-Planck-Institut für Struktur und Dynamik der Materie, 22761 Hamburg, Germany — 4Ikerbasque - Basque Foundation for Science, Spain
Dynamics of low-energy photoelectrons, generated by multiphoton ionization from near-infrared (NIR) laser pulses, in the presence of intense near single-cycle carrier-envelope phase stable terahertz (THz) pulses, were experimentally investigated, using a velocity-map imaging spectrometer (VMIS). For certain time delays between the NIR and THz pulses, a strong modulation of the photoelectron momentum distribution was observed and attributed to rescattering from the ionic core. During the rescattering process, an additional momentum was transferred to the photoelectrons leading to a higher kinetic energy in the continuum in contrast to directly emitted photoelectrons that are not rescattered. A classical two-step (CTS) model, based on solving classical photoelectron trajectories, indicates that a few photoelectrons reach a distance on the order of 20 nm before they are retracted and rescattered from the ionic core.