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Suppression of thermal nanoplasma emission in clusters strongly ionized by hard x-rays

Yoshiaki Kumagai 1, 2 Zoltan Jurek 3 Weiqing Xu 4 Vikrant Saxena 3 Hironobu Fukuzawa 5 Koji Motomura 5 Denys Iablonskyi 5 Kiyonobu Nagaya 6 Shin-Ichi Wada 6 Yuta Ito 5 Tsukasa Takanashi 7 Shuhei Yamada 7 Yuta Sakakibara 7 Toshiyuki Nishiyama Hiraki 8 Takayuki Umemoto 9 Minna Patanen 10 John Bozek 10 Ioan Dancus 11 Mihail Cernaianu 11 Catalin Miron 12 Tobias Bauer 13 Melanie Mucke 14 Edwin Kukk 15 Shigeki Owada 16 Tadashi Togashi 17 Kensuke Tono 17 Makina Yabashi 16 Sang-Kil Son 3 Beata Ziaja 3 Robin Santra 3 Kiyoshi Ueda 5 
Abstract : Using electron and ion spectroscopy, we studied the electron and nuclear dynamics in ~50 000-atom large krypton clusters, following excitation with an intense hard x-ray pulse. Beyond the single pulse experiment, we also present the results of a time-resolved, x-ray pump–near-infrared probe measurement that allows one to learn about the time evolution of the system. After core ionization of the atoms by x-ray photons, trapped Auger and secondary electrons form a nanoplasma in which the krypton ions are embedded, according to the already published scenario. While the ion data show expected features, the electron emission spectra miss the expected pump–probe delay-dependent enhancement except for a slight enhancement in the energy range below 2 eV. Theoretical simulations help to reveal that, due to the deep trapping potential of the ions during the long time expansion accompanied by electron–ion recombination, thermal emission from the transient nanoplasma becomes quenched.
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Submitted on : Wednesday, April 7, 2021 - 4:06:54 PM
Last modification on : Sunday, June 26, 2022 - 3:06:54 AM

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Yoshiaki Kumagai, Zoltan Jurek, Weiqing Xu, Vikrant Saxena, Hironobu Fukuzawa, et al.. Suppression of thermal nanoplasma emission in clusters strongly ionized by hard x-rays. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2021, 54 (4), pp.044001. ⟨10.1088/1361-6455/abd878⟩. ⟨cea-03191956⟩



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