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Article Dans Une Revue Nature Communications Année : 2019

Real-time observation of X-ray-induced intramolecular and interatomic electronic decay in CH2I2

Edwin Kukk
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Christophe Nicolas
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Kazuki Asa
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Yuhiro Sato
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Tsukasa Sakai
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Kenji Matsunami
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Per Johnsson
Kuno Kooser
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Xiao-Jing Liu
  • Fonction : Auteur

Résumé

The increasing availability of X-ray free-electron lasers (XFELs) has catalyzed the development of single-object structural determination and of structural dynamics tracking in realtime. Disentangling the molecular-level reactions triggered by the interaction with an XFEL pulse is a fundamental step towards developing such applications. Here we report real-time observations of XFEL-induced electronic decay via short-lived transient electronic states in the diiodomethane molecule, using a femtosecond near-infrared probe laser. We determine the lifetimes of the transient states populated during the XFEL-induced Auger cascades and find that multiply charged iodine ions are issued from short-lived (∼20 fs) transient states,whereas the singly charged ones originate from significantly longer-lived states (∼100 fs). We identify the mechanisms behind these different time scales: contrary to the short-lived transient states which relax by molecular Auger decay, the long-lived ones decay by an interatomic Coulombic decay between two iodine atoms, during the molecular fragmentation.

Dates et versions

hal-02132541 , version 1 (17-05-2019)

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Hironobu Fukuzawa, Tsukasa Takanashi, Edwin Kukk, Koji Motomura, Shin-Ichi Wada, et al.. Real-time observation of X-ray-induced intramolecular and interatomic electronic decay in CH2I2. Nature Communications, 2019, 10 (1), ⟨10.1038/s41467-019-10060-z⟩. ⟨hal-02132541⟩
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