Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 10: Collisions and Reactions
MO 10.4: Talk
Wednesday, March 11, 2020, 11:45–12:00, f142
X-ray-induced ignition of a helium nanoplasma — •Cristian Medina1, Dominik Schomas1, Markus Debatin1, Ltaif Ltaif2, Robert Moshammer3, Thomas Pfeifer3, Sivarama Krishnan4, Suddhasattwa Mandal5, Andreas Heidenreich6, Frank Stienkemeier1, and Marcel Mudrich2 — 1Albert-Ludwigs-Universität, Freiburg — 2Aarhus University, Aarhus — 3Max-Planck-Institut für Kernphysik, Heidelberg — 4Indian Institute of Technology Madras, Chennai, India — 5Indian Institute of Science Education and Research, Pune, India — 6Basque Foundation for Science, Bilbao
Helium Nanoplasmas are usually created by intense near-infrared laser pulses. After tunnel-ionization of the cluster or some dopant atoms, the cluster fully avalanche-ionizes as the electrons are driven back and forth through the cluster by the laser field. Here, we demonstrate a different scheme for igniting the nanoplasma on helium nanodroplets doped with heavy rare gas atoms. An ultrashort x-ray pulse (FLASH-1 at DESY, Hamburg) first inner-shell ionizes the dopant cluster, followed by Auger decay and charge-transfer ionization of the helium shell. A second near-infrared pulse then drives the nanoplasma at variable delay with respect to the x-ray pulse. The yields of electrons and helium ions are recorded for different dopant species (Ar, Kr, Xe), helium droplet sizes, and laser pulse intensities.