| Autor: |
C Medina, A Ø Lægdsmand, L Ben Ltaief, Z Hoque, A H Roos, L Jurkovičová, O Hort, O Finke, M Albrecht, J Nejdl, F Stienkemeier, J Andreasson, E Klimešová, M Krikunova, A Heidenreich, M Mudrich |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 25, Iss 5, p 053030 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/acd5f6 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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