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Appl. Sci. 2017, 7(5), 529;

X-ray Pump–Probe Investigation of Charge and Dissociation Dynamics in Methyl Iodine Molecule

Center for High Energy Density Science, University of Texas, Austin, TX 78712, USA
Department of Physics, University of Connecticut, Storrs, CT 06269, USA
Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
Authors to whom correspondence should be addressed.
Academic Editor: Kiyoshi Ueda
Received: 26 April 2017 / Revised: 15 May 2017 / Accepted: 15 May 2017 / Published: 19 May 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
Full-Text   |   PDF [3114 KB, uploaded 19 May 2017]   |  


Molecular dynamics is of fundamental interest in natural science research. The capability of investigating molecular dynamics is one of the various motivations for ultrafast optics. We present our investigation of photoionization and nuclear dynamics in methyl iodine (CH3I) molecule with an X-ray pump X-ray probe scheme. The pump–probe experiment was realized with a two-mirror X-ray split and delay apparatus. Time-of-flight mass spectra at various pump–probe delay times were recorded to obtain the time profile for the creation of high charge states via sequential ionization and for molecular dissociation. We observed high charge states of atomic iodine up to 29+, and visualized the evolution of creating these high atomic ion charge states, including their population suppression and enhancement as the arrival time of the second X-ray pulse was varied. We also show the evolution of the kinetics of the high charge states upon the timing of their creation during the ionization-dissociation coupled dynamics. We demonstrate the implementation of X-ray pump–probe methodology for investigating X-ray induced molecular dynamics with femtosecond temporal resolution. The results indicate the footprints of ionization that lead to high charge states, probing the long-range potential curves of the high charge states. View Full-Text
Keywords: free electron laser; X-ray pump–probe; molecular dynamics; charge dynamics free electron laser; X-ray pump–probe; molecular dynamics; charge dynamics

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Fang, L.; Xiong, H.; Kukk, E.; Berrah, N. X-ray Pump–Probe Investigation of Charge and Dissociation Dynamics in Methyl Iodine Molecule. Appl. Sci. 2017, 7, 529.

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