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Title: Nanoplasma Formation by High Intensity Hard X-rays
Authors: Tachibana, T
Jurek, Z
Fukuzawa, H
Motomura, K
Nagaya, K  kyouindb  KAKEN_id
Wada, S
Johnsson, P
Siano, M
Mondal, S
Ito, Y
Kimura, M
Sakai, T
Matsunami, K
Hayashita, H
Kajikawa, J
Liu, X-J
Robert, E
Miron, C
Feifel, R
Marangos, J P
Tono, K
Inubushi, Y
Yabashi, M
Son, S-K
Ziaja, B
Yao, M
Santra, R
Ueda, K
Author's alias: 福澤, 宏宣
永谷, 清信
和田, 真一
登野, 健介
矢橋, 牧名
八尾, 誠
上田, 潔
Keywords: Kinetics and dynamics
Atomic and molecular interactions with photons
Issue Date: 16-Jun-2015
Publisher: Nature Publishing Group
Journal title: Scientific reports
Volume: 5
Thesis number: 10977
Abstract: Using electron spectroscopy, we have investigated nanoplasma formation from noble gas clusters exposed to high-intensity hard-x-ray pulses at ~5 keV. Our experiment was carried out at the SPring-8 Angstrom Compact free electron LAser (SACLA) facility in Japan. Dedicated theoretical simulations were performed with the molecular dynamics tool XMDYN. We found that in this unprecedented wavelength regime nanoplasma formation is a highly indirect process. In the argon clusters investigated, nanoplasma is mainly formed through secondary electron cascading initiated by slow Auger electrons. Energy is distributed within the sample entirely through Auger processes and secondary electron cascading following photoabsorption, as in the hard x-ray regime there is no direct energy transfer from the field to the plasma. This plasma formation mechanism is specific to the hard-x-ray regime and may, thus, also be important for XFEL-based molecular imaging studies. In xenon clusters, photo- and Auger electrons contribute more significantly to the nanoplasma formation. Good agreement between experiment and simulations validates our modelling approach. This has wide-ranging implications for our ability to quantitatively predict the behavior of complex molecular systems irradiated by high-intensity hard x-rays.
Description: 超強力X線による極微小プラズマ生成を発見 -X線自由電子レーザーを利用したイメージングに重要なメッセージ-. 京都大学プレスリリース. 2015-07-07.
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
DOI(Published Version): 10.1038/srep10977
PubMed ID: 26077863
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