Statistical model of radiation damage within an atomic cluster irradiated by photons from free-electron-laser

Ziaja, Beata; Weckert, E.; Möller, Thomas

doi:10.1017/s0263034607000523

Cited by 17 publications

(12 citation statements)

References 9 publications

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“…[76,78] for describing the evolution of electron densities in solids within the valence and conduction bands. Assuming the homogeneous system and neglecting long term interactions, we can introduce periodic boundary conditions and reduce Eqs.…”

Section: Kinetic Approachmentioning

confidence: 99%

Modelling ultrafast transitions within laser-irradiated solids

Ziaja

Medvedev

2012

High Energy Density Physics

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Section: Kinetic Approachmentioning

confidence: 99%

Modelling ultrafast transitions within laser-irradiated solids

Ziaja

Medvedev

2012

High Energy Density Physics

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“…Atomic potentials then correspond to the potentials of isolated atoms/ions. In order to follow the cluster evolution, we will use the statistical Boltzmann approach proposed in [46,47]. Our Boltzmann code solves the full kinetic equations for electron and ion densities within the irradiated sample.…”

Section: Motivation For This Studymentioning

confidence: 99%

“…Comparing with the state from Refs. [46,47], our model has been significantly extended and improved. More interactions are now treated and included into the programme.…”

Section: Motivation For This Studymentioning

confidence: 99%

Femtosecond non-equilibrium dynamics of clusters irradiated with short intense VUV pulses

et al. 2008

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The kinetic Boltzmann equation is used to model the non-equilibrium ionization phase that initiates the evolution of atomic clusters irradiated with single pulses of intense vacuum ultraviolet radiation. The duration of the pulses is ≤ 50 fs and their intensity in the focus is ≤ 10 14 W/cm 2 . This statistical model includes various processes contributing to the sample dynamics at this particular radiation wavelength, and is computationally efficient also for large samples. Two effects are investigated in detail: the impact of the electron heating rate and the effect of the plasma environment on the overall ionization dynamics. Results on the maximal ion charge, the average ion charge and the average energy absorbed per atom estimated with this model are compared to the experimental data obtained at the free-electron-laser facility FLASH at DESY. Our analysis confirms that the dynamics within the irradiated samples is complex, and the total ionization rate is the resultant of various processes. In particular, within the theoretical framework defined in this model the high charge states as observed in experiment cannot be obtained with the standard heating rates derived with Coulomb atomic potentials. Such high charge states can be created with the enhanced heating rates derived with the effective atomic potentials. The modification of ionization potentials by plasma environment is found to have less effect on the ionization 1 Author to whom correspondence should be addressed. Electronic mail: ziaja@mail.desy.de dynamics than the electron heating rate. We believe that our results are a step towards better understanding the dynamics within the samples irradiated with intense VUV radiation.

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“…Theoretically, such matter is difficult to handle, with electrostatic and thermal energies at the same order of magnitude, rather than one being a perturbation of the other, as in solid state physics or classical plasma physics (Ziaja et al, 2007). Experimentally, the difficulty in producing WDM with a sufficient volume and lifetime for experimental studies is a challenge (Cao et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

XUV spectroscopic characterization of warm dense aluminum plasmas generated by the free-electron-laser FLASH

et al. 2012

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We report on experiments aimed at the generation and characterization of solid density plasmas at the free-electron laser FLASH in Hamburg. Aluminum samples were irradiated with XUV pulses at 13.5 nm wavelength (92 eV photon energy). The pulses with duration of a few tens of femtoseconds and pulse energy up to 100 μJ are focused to intensities ranging between 10 13 and 10 17 W/cm 2 . We investigate the absorption and temporal evolution of the sample under irradiation by use of XUV and optical spectroscopy. We discuss the origin of saturable absorption, radiative decay, bremsstrahlung and atomic and ionic line emission. Our experimental results are in good agreement with simulations.

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Statistical model of radiation damage within an atomic cluster irradiated by photons from free-electron-laser

Cited by 17 publications

References 9 publications

Modelling ultrafast transitions within laser-irradiated solids

Modelling ultrafast transitions within laser-irradiated solids

Femtosecond non-equilibrium dynamics of clusters irradiated with short intense VUV pulses

XUV spectroscopic characterization of warm dense aluminum plasmas generated by the free-electron-laser FLASH

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