|home | iBib | list | admin|
Relativistic effects in x-ray multiphoton ionization dynamics
Sang-Kil Son13th International Conference on Relativistic Effects in Heavy-Element Chemistry and Physics
(Assisi, Italy, September 26-30, 2022) [invited talk]
X-ray Free-Electron Lasers (XFELs) have brought an impact on various scientific areas across physics, chemistry, materials science, and life science. When an atom or a molecule is exposed to an intense x-ray pulse that is generated by XFEL, it is ionized to a highly charged ion via a sequence of single-photon ionization and accompanying relaxation processes. Understanding of this x-ray multiphoton ionization dynamics is crucial for most XFEL applications. To this end, we have developed the dedicated toolkits to investigate x-ray-induced processes and to simulate ionization dynamics. If x-ray multiphoton ionization involves deep inner-shell electrons in heavy atoms, energy shifts by relativistic effects play an important role in ionization dynamics [1,2]. In this talk, we will present recent XFEL studies of atomic and molecular systems containing heavy atoms irradiated by intense XFEL pulses [1–5]. In particular, we will demonstrate how the relativistic effects are exhibited in x-ray multiphoton ionization dynamics of xenon atoms [1,2], in combination with resonances of highly charged ions that are initially hidden in neutral xenon atoms [1–3]. In molecular cases [4,5] we did not take relativistic effects into account, but this remains a challenge for the future.  K. Toyota, S.-K. Son, and R. Santra, Phys. Rev. A (2017), 95, 043412;  B. Rudek et al., Nat. Commun. (2018), 9, 4200;  S.-K. Son, R. Boll, and R. Santra, Phys. Rev. Res. (2020), 2, 023053;  X. Li et al., Phys. Rev. Lett. (2021), 127, 093202;  R. Boll et al., Nat. Phys. (2022), 18, 423.
made by ZN