Abstract
Abstract
We study the dynamics of avalanche ionization of pure helium nanodroplets activated by a weak extreme-ultraviolet (XUV) pulse and driven by an intense near-infrared (NIR) pulse. In addition to a transient enhancement of ignition of a nanoplasma at short delay times
∼
200
fs, long-term activation of the nanodroplets lasting up to a few nanoseconds is observed. Molecular dynamics simulations suggest that the short-term activation is caused by the injection of seed electrons into the droplets by XUV photoemission. Long-term activation appears due to electrons remaining loosely bound to photoions which form stable ‘snowball’ structures in the droplets. Thus, we show that XUV irradiation can induce long-lasting changes of the strong-field optical properties of nanoparticles, potentially opening new routes to controlling avalanche-ionization phenomena in nanostructures and condensed-phase systems.
Funder
European Cooperation in Science and Technology
European Regional Development Fund
Agentúra Ministerstva Školstva, Vedy, Výskumu a Športu SR
Deutsche Forschungsgemeinschaft
Carlsbergfondet
Ekonomiaren Garapen eta Lehiakortasun Saila, Eusko Jaurlaritza
Euskal Herriko Unibertsitatea
Subject
General Physics and Astronomy
Cited by
2 articles.
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