Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Atomic Physics, Molecular Physics, and Quantum Optics with X-ray FELs (joint session MO/A)
A 30.7: Vortrag
Donnerstag, 14. März 2019, 12:00–12:15, S HS 002 Biologie
Giant Enhancement of Molecular Ionization at High X-ray Intensity — •Ludger Inhester1, Yajiang Hao2, Sang-Kil Son1, and Robin Santra1,3 — 1Center or Free-Electron Laser Science, DESY, Hamburg — 2Department of Physics, University of Science and Technology Beijing — 3Department of Physics, Universität Hamburg
The ultraintense and ultrashort x-ray pulses provided by X-ray Free-Electron Lasers (XFELs) sequentially ionize molecular samples many times. We have developed an ab-initio electronic structure toolkit, XMOLECULE[1,2], that models this multiple ionization dynamics. Our calculations show that the rearrangement of charges between different parts of a molecule plays an important role for the ion yield distribution. In this context, we have recently discovered that under intense x-ray radiation the total charge yield of a molecule is enhanced compared to independent atoms[2,3].
We report here on new theoretical results for iodobenzene (C6H5I) that show an even stronger ionization enhancement than previously observed for iodomethane (CH3I)[3]. This finding emphasizes the relevance of the charge-rearrangement-enhanced X-ray ionization of molecules (CREXIM) for the radiation damage in experiments with tightly focused XFEL beams.
[1] Struct. Dyn. 2, 041707 (2015). [2] Phys. Rev. A 94, 023422 (2016) [3] Nature 546, 129-132 (2017)