Speaker
Marcel Mudrich
(Aarhus University)
Description
Nanoplasmas formed from doped helium nanodroplets by irradiation with intense near-infrared fs-pulses feature peculiar properties. A helium ionization avalanche is triggered by tunnel ionization of the dopant cluster at comparatively low light intensities (~1014 W/cm2). Subsequent light absorption is enhanced by resonances due to nanoplasma anisotropies [PRL 107, 173402 (2011)] and expansion [NJP 14 075016 (2012)]. Consequently, dopant and helium atoms charge up to high charge states [J. Mod. Opt. 64, 1061 (2017)], and energetic ions and electrons are emitted by Coulomb explosion. Surprisingly, our single-shot velocity-map images of nanoplasma electrons display sharp electron energies peaked at ~eV energies. We discuss the systematics of electron and ion spectra, as well as possible interpretations based on classical MD simulations.
Primary authors
A. Heidenreich
(Euskal Herriko Unibertsitatea and Donostia International Physics Center, Donostia; IKERBASQUE, Basque Foundation for Science, Bilbao)
D. Schomas
(Universität Freiburg)
Marcel Mudrich
(Aarhus University)
N. Camus
(MPI für Kernphysik, Heidelberg)
N. Rendler
(Universität Freiburg)
R. Moshammer
(MPI für Kernphysik, Heidelberg)
T. Pfeifer
(MPI für Kernphysik, Heidelberg)
