State-resolved ionization dynamics of neon atom induced by x-ray free-electron-laser pulses

Abstract

We present a theoretical framework to describe state-resolved ionization dynamics of neon atoms driven by ultraintense x-ray free-electron-laser pulses. In general, x-ray multiphoton ionization dynamics of atoms have been described by 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 calculation, based on first-order many-body perturbation theory, with a Monte Carlo rate-equation method, enables us to study state-resolved dynamics based on time-dependent state populations. Our results demonstrate that configuration-based and state-resolved calculations provide similar charge-state distributions, but the differences are visible when resonant excitations are involved, which are also reflected in calculated time-integrated electron and photon spectra. In addition, time-resolved spectra of ions, electrons, and photons are analyzed for different pulse durations to explore how frustrated absorption manifests itself during the ionization dynamics of neon atoms.

16 pages and 10 figures

References in corpus (7)

• Studying ultrafast Rabi dynamics with a short-wavelength seeded free-electron laser
• Monte Carlo calculation of ion, electron, and photon spectra of xenon atoms in x-ray free-electron laser pulses
• Impact of ultrafast electronic damage in single particle x-ray imaging experiments
• Enhanced nonlinear response of Ne${}^{8+}$ to intense ultrafast x rays
• Resonance fluorescence in ultrafast and intense x-ray free-electron-laser pulses
• Wave-packet propagation based calculation of above-threshold ionization in the x-ray regime
• Theoretical investigation of orbital alignment of x-ray-ionized atoms in exotic electronic configurations