Ultrafast electronic processes in an insulator: The Be and O sites in BeO

Schiwietz, G.; Beye, Martin; Czerski, K.; Föhlisch, Alexander; Roth, M.; Schlappa, Justine; Staufenbiel, F.; Suljoti, Edlira; Kuusik, I.; Grande, P.L.

doi:10.1016/j.nimb.2012.12.099

Cited by 6 publications

(3 citation statements)

References 58 publications

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“…7 with our depiction. 8,17,74,75,80 In this set of the experiments, three techniques were used simultaneously: XAS, XES and X-ray scattering in solution samples. The rst two methods provide information about the electronic structures of the Fe(II) center in [Fe(II)(bpy) 3 ] 2+ and the third method will obtain nuclear structures of the complex as well as the surrounding solvent molecules in the ground-and the excited-states.…”

Section: Combined Studies Using Optical and X-ray Transient Absorptio...mentioning

confidence: 99%

Recent advances on ultrafast X-ray spectroscopy in the chemical sciences

2014

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Section: Combined Studies Using Optical and X-ray Transient Absorptio...mentioning

confidence: 99%

Recent advances on ultrafast X-ray spectroscopy in the chemical sciences

2014

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“…It should be noted that the presented idea for the 'femto-clock' based on the collection of photon spectra differs from the earlier experiments with Auger electron spectra emitted from SHI-irradiated targets [13,43]. Indeed, the same ideology of extracting the time grid from the energy-resolved spectra can in principle be applied for Auger electron spectra.…”

Section: Photon Versus Electron Emissionmentioning

confidence: 99%

Femto-clock for the electron kinetics in swift heavy ion tracks

Medvedev¹,

Волков²

2017

J. Phys. D: Appl. Phys.

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We propose a conceptual idea for developing a technique for the monitoring of transient states of the electronic system of materials irradiated with swift heavy ions (SHIs). The method is based on spectroscopic measurements of photon emission due to radiative decay of holes from different inner shells of ionized target atoms. Since a hole in each shell of each element decays with its own characteristic time, it potentially allows the extraction of femtosecond time-resolved information about the excited electronic system in the valence and conduction band of a target. We suggest that prior ion implantation could be used for constructing a selected time grid for this technique. We also discuss the shift of the ionization potentials in atoms multiple-ionized by a direct SHI impact that should allow us to distinguish the track core within a few angstroms around the ion trajectory from the periphery of a track.

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“…Without it, all the models are validated only indirectly, e.g., via spectra of emitted electrons. 422 Nonequilibrium electronic ensemble and electron transport should be monitored at their natural timescales. Femtosecond resolution has been achieved in x-ray laser irradiation with the pump-probe technique (see, e.g., Refs.…”

Section: B Potential Experimentsmentioning

confidence: 99%

Frontiers, challenges, and solutions in modeling of swift heavy ion effects in materials

Medvedev

Волков

Rymzhanov

et al. 2023

Journal of Applied Physics

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Since a few breakthroughs in the fundamental understanding of the effects of swift heavy ions (SHIs) decelerating in the electronic stopping regime in the matter have been achieved in the last decade, it motivated us to review the state-of-the-art approaches in the modeling of SHI effects. The SHI track kinetics occurs via several well-separated stages and spans many orders of magnitude in time: from attoseconds in ion-impact ionization depositing an extreme amount of energy in a target to femtoseconds of electron transport and hole cascades, to picoseconds of lattice excitation and response, to nanoseconds of atomic relaxation, and even longer times of the final macroscopic reaction. Each stage requires its own approaches for quantitative description. We discuss that understanding the links between the stages makes it possible to describe the entire track kinetics within a hybrid multiscale model without fitting procedures. The review focuses on the underlying physical mechanisms of each process, the dominant effects they produce, and the limitations of the existing approaches, as well as various numerical techniques implementing these models. It provides an overview of the ab initio-based modeling of the evolution of the electronic properties, Monte Carlo simulations of nonequilibrium electronic transport, molecular dynamics modeling of atomic reaction including phase transformations and damage on the surface and in the bulk, kinetic Mote Carlo of atomic defect kinetics, and finite-difference methods of track interaction with chemical solvents describing etching kinetics. We outline the modern methods that couple these approaches into multiscale and combined multidisciplinary models and point to their bottlenecks, strengths, and weaknesses. The analysis is accompanied by examples of important results, improving the understanding of track formation in various materials. Summarizing the most recent advances in the field of the track formation process, the review delivers a comprehensive picture and detailed understanding of the phenomenon. Important future directions of research and model development are also outlined.

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Ultrafast electronic processes in an insulator: The Be and O sites in BeO

Abstract: The short-time dynamics of amorphous beryllium oxide (a-BeO) has been investigated for electronic excitation/ionization by fast incident electrons, as well as by Ar 7+ , Ar

Cited by 6 publications

References 58 publications

Recent advances on ultrafast X-ray spectroscopy in the chemical sciences

Recent advances on ultrafast X-ray spectroscopy in the chemical sciences

Femto-clock for the electron kinetics in swift heavy ion tracks

Frontiers, challenges, and solutions in modeling of swift heavy ion effects in materials

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