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Ultrafast dynamics of atoms and molecules induced by intense x-ray free-electron laser pulses
Sang-Kil Son28th Annual International Laser Physics Workshop
(Gyeongju, Korea, July 8-12, 2019) [invited talk]
X-ray free-electron lasers (XFELs), featuring ultraintense and ultrafast x-ray pulses, have brought an impact on various scientific fields, including AMO physics, material science, astrophysics, and molecular biology. Understanding how matter interacts with intense x-ray pulses is fundamental and crucial for most XFEL applications. The XFEL-matter interaction is characterized by sequential multiphoton multiple ionization dynamics, where many x-ray photons are absorbed and many electrons are ejected in a sequence, which differs from multiphoton processes in the optical strong-field regime, where many photons are simultaneously absorbed to ionize a single electron. An accurate description of the XFEL-matter interaction, however, poses a great challenge because of extremely complicated processes involved in ultrafast dynamics. To address this challenge, we have developed dedicated theoretical tools, XATOM and XMOLECULE. In this contribution, I will discuss two recent studies of ultrafast phenomena with XFELs: resonance-enhanced x-ray ionization in xenon atoms and charge-rearrangement-enhanced x-ray ionization in iodine-containing molecules. For both cases, I will present quantitative comparisons between theoretical and experimental results of ultrafast ionization and fragmentation dynamics induced by intense XFEL pulses. These works demonstrate the predictive power of our modeling and provide new insights of the XFEL-matter interaction to be taken into account for interpreting and designing future XFEL-driven experiments.
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