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

Medvedev, Nikita; Волков, А. Е.

doi:10.1088/1361-6463/aa87c6

Cited by 2 publications

(5 citation statements)

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“…124 It depends on the particular configuration of electron populations on all the shells of an ion, but the general tendency is that the ionization potential increases with the increasing charge (ionization degree) of an ion. 125 That means, in a multiple-ionized ion of a target, ionization potentials increase, making it more difficult to ionize each successive electron. 125 Due to this difference, using atomic ionization potentials, thus, produces more ionizations (and higher energy losses) than it would if the ionization potential changes were accounted for.…”

Section: Electronic Energy Lossmentioning

confidence: 99%

“…125 That means, in a multiple-ionized ion of a target, ionization potentials increase, making it more difficult to ionize each successive electron. 125 Due to this difference, using atomic ionization potentials, thus, produces more ionizations (and higher energy losses) than it would if the ionization potential changes were accounted for. This kind of non-linear response of the target seems to be a reason for the need to adjust the energy losses within the linear response theory-which is done via using an effective charge.…”

Section: Electronic Energy Lossmentioning

confidence: 99%

“…397,398 At the same time, each ion configuration has its own characteristic Auger-and radiative decay times, different from neutral atoms. 125,399 This effect potentially enables to reconstruct the time-resolved kinetics in SHI tracks by time-sorting of the photon or Auger spectra emitted from a target. 73,125 Measured spectra of photons or Auger electrons allow connecting the energy position of each peak with its own characteristic decay time.…”

Section: A Electron Emissionmentioning

confidence: 99%

“…73 The same scheme for constructing a femto-clock on the basis of photon spectra was proposed theoretically but has not yet been implemented experimentally. 125 The emission of particles from the surface carries out some fraction of energy, thereby reducing the dose deposited by an SHI. It is especially noticeable in the first few nanometers of the material (see an example of 200 MeV Au ion irradiation of a layer of CaF 2 in Fig.…”

Section: A Electron Emissionmentioning

confidence: 99%

“…426 Alternatively, time-sorting of energy spectra of emitted Auger-electrons 73 or photons may be used to reconstruct the evolution of the electronic system. 125 The electron-ion coupling and energy exchange are still discussed questions. The electron-phonon coupling factor at elevated electronic temperatures has only been measured (in laser-based experiments) in a limited number of metals (see discussion in Ref.…”

Section: B Potential Experimentsmentioning

confidence: 99%

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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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Section: Electronic Energy Lossmentioning

confidence: 99%

Section: Electronic Energy Lossmentioning

confidence: 99%