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Quantum-state-resolved ionization dynamics induced by x-ray free-electron laser pulses
Sang-Kil Son, Laura Budewig, and Robin Santra
International Workshop on Ultra-Fast Science (East China Normal University, Shanghai, China, April 21-23, 2024) [poster] [BibTeX] [poster: 6Mb] http://www.lps.ecnu.edu.cn/wufs/
Intense x-ray free-electron laser pulses can induce multiple sequences of inner-shell ionization events and
accompanying decay processes in atoms, producing highly-charged atomic ions. In general, x-ray
multiphoton ionization dynamics have been described in terms of time-dependent populations of the
electronic configurations visited during the ionization dynamics, neglecting individual state-to-state
transition rates and energies. Combining a state-resolved electronic-structure method based on first-order
many-body perturbation theory [1] with a Monte Carlo rate-equation method [2] enables us to study state-
resolved dynamics based on time-dependent quantum-state populations. Here we present a theoretical
study of state-resolved x-ray multiphoton ionization dynamics of neon atoms [3]. Our results demonstrate
that configuration-based and state-resolved calculations provide similar charge-state distributions, but
differences are visible when resonant excitations are involved. Calculated time-resolved spectra of ions,
electrons, and photons allow us to investigate ultrafast dynamics of x-ray multiphoton ionization in detail.
In addition, we will present a comparison with a recent experiment on Ne [4] and discuss how to handle
the extremely large number of atomic parameters involved in state-resolved dynamics calculations via
machine-learning techniques [5].
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[1] L. Budewig, S.-K. Son, and R. Santra, Phys. Rev. A 105, 033111 (2022).
[2] S.-K. Son and R. Santra, Phys. Rev. A 85, 063415 (2012).
[3] L. Budewig, S.-K. Son, and R. Santra, Phys. Rev. A 107, 013102 (2023).
[4] S.-K. Son, T. Baumann, et al., in preparation.
[5] L. Budewig, S.-K. Son, Z. Jurek, M. M. Abdullah, M. Tropmann-Frick, and R. Santra, submitted. Tags: Ne,
state-resolved,
ionization dynamics,
XFEL,
XATOM,
CFEL,
DESY
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