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BibTeX file of [Wirok-Stoletow22] [show it without abstract]

@article{Wirok-Stoletow22,
    author={Stanislaw Wirok-Stoletow and Rui Jin and Daria Kolbasova and Sang-Kil Son and Andrew Aquila and Robin Santra},
    title={Nonsequential two-photon absorption in solid {Ge} irradiated by an intense x-ray free-electron-laser pulse},
    journal={Phys. Rev. A},
    volume={106},
    pages={023118},
    year={2022},
    keywords={TDCIS; XMDYN; two-photon; photoionization; Ge; plasma; CFEL; DESY; ;},
    url={https://doi.org/10.1103/PhysRevA.106.023118},
    doi={10.1103/PhysRevA.106.023118},
    abstract={We theoretically investigate the formation of highly charged ions in germanium (Ge) solid driven by intense, ultrashort x-ray pulses and its effect on the cross sections for nonsequential two-photon absorption from the $K$ shell. Our investigation is related to an experiment conducted at the Linac Coherent Light Source, in which $K$$\alpha$ fluorescence was measured to identify nonsequential two-photon ionization. When a solid Ge target is irradiated by an intense x-ray free-electron-laser (XFEL) pulse, it undergoes severe ionization and turns into a plasma state. We employ a Monte Carlo-molecular dynamics approach to simulate the time evolution of Ge plasma formation, and the time-dependent configuration-interaction-singles method for cross-section calculations, taking into account various experimental x-ray beam parameters and Ge charge states created during the plasma formation dynamics. We find that under the given experimental condition at a photon energy of 7200 eV, charged ions are formed quickly (the average charge is $\sim$+6 at the peak of the pulse and $\sim$+10 at the end of the pulse). The cross sections of Ge for nonsequential two-photon absorption, however, turn out to be insensitive to different charge states, and the average value over all computed data is $(2.61\pm0.05)\times10^{-59}$~cm$^4$s. Our work proposes a theoretical framework of photoabsorption cross-section calculations under the influence of plasma formation, when a solid target is employed in XFEL experiments.
    } }

Stanislaw Wirok-Stoletow, Rui Jin, Daria Kolbasova, Sang-Kil Son, Andrew Aquila, and Robin Santra, Nonsequential two-photon absorption in solid Ge irradiated by an intense x-ray free-electron-laser pulse, Phys. Rev. A 106, 023118 (2022) [pdf][pdf][abstract][abstract][link]doi:10.1103/PhysRevA.106.023118


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