Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 31: Poster Session III
A 31.43: Poster
Thursday, March 9, 2017, 17:00–19:00, P OG1
Charging Dynamics of Dopants in Helium Nanoplasmas — •Dominik Schomas1, Andreas Heidenreich2, 3, Barbara Grüner1, Frank Stienkemeier1, Siva Rama Krishnan4, and Marcel Mudrich1 — 1Albert-Ludwigs Universität Freiburg — 2Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), Donostia — 3IKERBASQUE, Basque Foundation for Science, Bilbao — 4Indian Institute of Technology - Madras, Chennai
Helium nanodroplets irradiated by intense near-infrared (NIR) laser pulses ignite and form highly ionized nanoplasmas even at laser intensities where helium is not directly ionized by the optical field, provided the droplets contain a few dopant atoms. We present a combined theoretical and experimental study of the helium nanoplasma ignition dynamics for various dopant species. In particular, we elucidate the interplay of dopant ionization inducing the ignition of a helium nanoplasma, and the charging of the dopant atoms driven by the ionized helium host. Most efficient nanoplasma ignition and charging is found when doping helium droplets with xenon atoms, in which case high charge states both of helium (He 2+) and of xenon (Xe21+) are detected.