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Long-lasting XUV activation of helium nanodroplets for avalanche ionization

  • 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 ${\sim}200$ 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.

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Author:Cristian MedinaORCiD, Asbjørn Ørnemark Lægdsmand, Ltaief Ben LtaiefORCiD, Ziaul HoqueORCiD, Andreas Hult RoosORCiD, Lucie JurkovičováORCiD, Ondřej HortORCiD, Ondřej FinkeORCiD, Martin AlbrechtORCiD, Jaroslav NejdlORCiD, Frank StienkemeierORCiD, Jakob AndreassonORCiD, Eva KlimešováORCiD, Maria KrikunovaORCiD, Andreas HeidenreichORCiD, Marcel MudrichORCiD
URN:urn:nbn:de:kobv:526-opus4-17701
DOI (Version of Record):https://doi.org/10.1088/1367-2630/acd5f6
Parent Title (English):New Journal of Physics
Publisher:Institute of Physics (IOP)
Document Type:Article
Language:English
Year of Publication:2023
Publishing Institution:Technische Hochschule Wildau
Release Date:2023/07/19
Tag:avalanche ionization; extreme ultraviolet; helium nanodroplet; high-harmonic generation; nanoplasma; pump–probe spectroscopy
Volume:25
Article Number:053030
Source:C Medina et al 2023 New J. Phys. 25 053030
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 621 Angewandte Physik
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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