Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 30: Atomic Clusters III (joint session A/MO)
A 30.1: Talk
Wednesday, March 7, 2018, 14:00–14:15, K 2.016
Single-shot electron imaging of helium nanoplasmas — •Dominik Schomas1, Nicolas Rendler1, Andreas Heidenreich2,3, Thomas Pfeifer4, Robert Moßhammer4, and Marcel Mudrich5 — 1Physikalisches Institut, Albert-Ludwigs-University, Freiburg — 2Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) — 3IKERBASQUE, Basque Foundation for Science — 4Max Planck Institute for Nuclear Physics, Heidelberg — 5stronomDepartment of Physics and Ay, Aarhus University
Strong femtosecond laserfields can turn a helium nanodroplet into a highly charged nanoplasma. The initial ignition just needs a few electrons provided by tunnel ionization of helium or a dopant particle to start an avalanche of ionizations. The cluster is then completely within a few femtoseconds. Repulsion between ions leads to Coulomb explosion of the cluster and highly energetic ions and electrons are produced. We use the velocity map imaging (VMI) technique to measure the energy and angular distribution of the electrons, and a time-of-flight (TOF) spectrometer to collect the ions. One helium droplet produces enough signal to measure VMI and TOF spectra for individual helium droplets hit by single laser pulses. With pump-probe measurements we investigate the time evolution of the system.