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Title: Ultrafast Dynamics of a Nucleobase Analogue Illuminated by a Short Intense X-ray Free Electron Laser Pulse
Authors: Nagaya, K.
Motomura, K.
Kukk, E.
Fukuzawa, H.
Wada, S.
Tachibana, T.
Ito, Y.
Mondal, S.
Sakai, T.
Matsunami, K.
Koga, R.
Ohmura, S.
Takahashi, Y.
Kanno, M.
Rudenko, A.
Nicolas, C.
Liu, X.-J.
Zhang, Y.
Chen, J.
Anand, M.
Jiang, Y. H.
Kim, D.-E.
Tono, K.
Yabashi, M.
Kono, H.
Miron, C.
Yao, M.
Ueda, K.
Author's alias: 永谷, 清信
クック, エドウィン
福澤, 宏宣
和田, 真一
大村, 訓史
登野, 健介
矢橋, 牧名
河野, 裕彦
ミロン, カタリン
八尾, 誠
上田, 潔
Issue Date: 16-Jun-2016
Publisher: American Physical Society
Journal title: Physical Review X
Volume: 6
Issue: 2
Thesis number: 021035
Abstract: Understanding x-ray radiation damage is a crucial issue for both medical applications of x rays and x-ray free-electron-laser (XFEL) science aimed at molecular imaging. Decrypting the charge and fragmentation dynamics of nucleobases, the smallest units of a macro-biomolecule, contributes to a bottom-up understanding of the damage via cascades of phenomena following x-ray exposure. We investigate experimentally and by numerical simulations the ultrafast radiation damage induced on a nucleobase analogue (5-iodouracil) by an ultrashort (10 fs) high-intensity radiation pulse generated by XFEL at SPring-8 Angstrom Compact free electron Laser (SACLA). The present study elucidates a plausible underlying radiosensitizing mechanism of 5-iodouracil. This mechanism is independent of the exact composition of 5-iodouracil and thus relevant to other such radiosensitizers. Furthermore, we found that despite a rapid increase of the net molecular charge in the presence of iodine, and of the ultrafast release of hydrogen, the other atoms are almost frozen within the 10-fs duration of the exposure. This validates single-shot molecular imaging as a consistent approach, provided the radiation pulse used is brief enough.
Description: X線自由電子レーザーの超短パルスでリボ核酸塩基分子中の電荷と原子の動きを可視化-ヨウ化ウラシルによる放射線増感効果の機構解明. 京都大学プレスリリース. 2016-07-04.
Rights: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
DOI(Published Version): 10.1103/PhysRevX.6.021035
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