University of Oulu

Yoshiaki Kumagai et al 2021 J. Phys. B: At. Mol. Opt. Phys. 54 044001.

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

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Author: Kumagai, Yoshiaki1,2; Jurek, Zoltan3,4; Xu, Weiqing1,5;
Organizations: 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
2Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, Japan
3Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
4The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
5School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
6Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
7RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
8Department of Physics, Kyoto University, Kyoto 606-8502, Japan
9Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
10Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, FR-91192 Gif-sur-Yvette Cedex, France
11Nano and molecular systems research unit, Faculty of Science, University of Oulu P.O.Box 3000, 90014 Oulu, Finland
12Extreme Light Infrastructure - Nuclear Physiscs (ELI-NP), "Horia Hulubei" National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, RO-077125 Măgurele, Jud. Ilfov, Romania
13Université Paris-Saclay, CEA, CNRS, LIDYL, 91191, Gif-sur-Yvette, France
14Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany
15Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
16Department of Physics and Astronomy, University of Turku 20014 Turku, Finland
17Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
18Institute of Nuclear Physics, PAS, Radzikowskiego 152, 31-342, Krakow, Poland
19Department of Physics, Universität Hamburg, 20355 Hamburg, Germany
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: IOP Publishing, 2021
Publish Date: 2022-03-01


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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Series: Journal of physics. B, Atomic, molecular and optical physics
ISSN: 0953-4075
ISSN-E: 1361-6455
ISSN-L: 0953-4075
Volume: 54
Issue: 4
Article number: 044001
DOI: 10.1088/1361-6455/abd878
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This study was supported by the X-ray Free Electron Laser Utilization Research Project and the X-ray Free Electron Laser Priority Strategy Program of the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT), by the Proposal Program of SACLA Experimental Instruments of RIKEN, by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grants No. JP21244042, No. JP23241033, No. JP15K17487, and No. 16K05016, by MEXT KAKENHI Grant No. JP22740264, by the IMRAM project, and by the National Nature Science Foundation of China Grant No. 11604003. H. F. and K. U. acknowledge support by the Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials. D. I. and Y. I. acknowledge support by IMRAM, Tohoku University. Tu. T. acknowledges support by JSPS KAKENHI Grant No. JP16J002270. K. N. and S. W. acknowledge support by the Research Program of ”Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” in ”Network Joint Research Center for Materials and Devices”. T. N. acknowledges support by the Research Program for Next Generation Young Scientists of ”Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” in ”Network Joint Research Center for Materials and Devices”.
Copyright information: © 2021 IOP Publishing Ltd. This is the Accepted Manuscript version of an article accepted for publication in Journal of Physics B: Atomic, Molecular and Optical Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at