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Journal Articles Journal of Physics B: Atomic, Molecular and Optical Physics Year : 2021

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

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Minna Patanen
John Bozek
Melanie Mucke
  • Function : Author
Edwin Kukk
  • Function : Author
Shigeki Owada
Makina Yabashi

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.

Dates and versions

cea-03191956 , version 1 (07-04-2021)

Identifiers

Cite

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, 2021, 54 (4), pp.044001. ⟨10.1088/1361-6455/abd878⟩. ⟨cea-03191956⟩
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