TY - JOUR A1 - Klimesova, Eva A1 - Kulyk, Olena A1 - Martin, Lucas Janos A1 - Schütte, Bernd A1 - Frühling, Ulrike A1 - Drescher, Markus A1 - Pan, Rui A1 - Stojanovic, Nikola A1 - Bermudez Macias, Ivette J. A1 - Düsterer, Stefan A1 - Andreasson, Jakob A1 - Wieland, Marek A1 - Krikunova, Maria T1 - Electron thermalization and ion acceleration in XUV-produced plasma from nanoparticles in He gas environment JF - New Journal of Physics N2 - We use intense femtosecond extreme ultraviolet (XUV) pulses with a photon energy of 92 eV from the FLASH free electron laser to irradiate substrate-free CsCl nanoparticles surrounded by a He gas with a number density of around 1015 cm−3. By simultaneously detecting electrons and energetic ions from the laser-irradiated micron-size target we study the acceleration mechanism of light ions at the microplasma-vacuum boundary as well as at the layer close to the nanoparticle surface. When the XUV pulse interacts with the gas alone, helium ions are accelerated to energies exceeding 100 eV. In the presence of the nanoparticle, light ions gain additional energy in the electric field around the ionized nanoparticle and their energy spectrum changes considerably. We present an electrostatic model to explain the ion acceleration mechanisms both with and without the nanoparticle and discuss the role of the gas environment in experiments. KW - light–matter interaction KW - free electron laser KW - nanoparticle injection KW - electron and ion spectroscopy Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-19818 VL - 27 PB - Institute of Physics Publishing (IOP); Deutsche Physikalische Gesellschaft ER -