Long-lasting XUV activation of helium nanodroplets for avalanche ionization

Author:

Medina C,Lægdsmand A Ø,Ltaief L BenORCID,Hoque Z,Roos A HORCID,Jurkovičová LORCID,Hort O,Finke O,Albrecht M,Nejdl J,Stienkemeier FORCID,Andreasson J,Klimešová EORCID,Krikunova M,Heidenreich AORCID,Mudrich MORCID

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

Publisher

IOP Publishing

Subject

General Physics and Astronomy

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