Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Poster Session I
A 25.31: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Single shot velocity map imaging of electrons from dopand-induced helium nanoplasmas in strong near-infrared laser pulses. — •Nicolas Rendler1, Dominik Schomas1, Cristian Medina1, Robert Moshammer2, Thomas Pfeifer2, Andreas Heidenreich3,4, and Marcel Mudrich5 — 1Albert Ludwigs University of Freiburg, Freiburg, Germany — 2Max Planck Institute for Nuclear Physics, Heidelberg, Germany — 3Faculty of Chemistry, University of the Basque Country (UPV/EHU) and Donostia International Physics Center (DIPC), Donostia, Spain — 4IKERBASQUE, Basque Foundation for Science, Bilbao, Spain — 5Aarhus University, Aarhus, Denmark
A doped helium nanodroplet irradiated by intense near-infrared (NIR) laser pulses forms a highly ionized nanoplasma even at laser intensities where the helium is not directly ionized. The dopant atoms provide first seed electrons which start the electron impact ionization avalanche of the whole droplet. The dynamics of ignition and explosion of the nanoplasma depends not only on the number and the kind of dopants but also on the droplet size and laser intensity. We present single shot velocity map imaging (VMI) measurements of electrons produced by irradiation of xenon doped helium nanodroplets with intense NIR femtosecond laser pulses at various laser intensities for different helium and dopant cluster sizes. The salient structures of the electron spectra are discussed and compared to molecular dynamics simulations. Additionally ion time of flight (TOF) spectra can be recorded in parallel to the electron VMI.