Multi-electron-recombination rates estimated within dense plasmas

Ziaja, Beata; Wang, F.; Weckert, E.

doi:10.1016/j.hedp.2009.06.002

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…We show that the commonly used semiemprical models 4,5 , implemented in many plasma-kinetics codes, underestimate the rate of collisional ionization by a considerable margin-a trend predicted by the theoretical investigations cited above 16,17,21 . As we will describe, our method relies on heating a solid target with the Linac Coherent Light Source (LCLS) X-ray free-electron laser (FEL).…”

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confidence: 67%

“…Indeed, it is predicted that many-body effects such as plasma screening and ionization potential depression (IPD) can already have a significant effect on these rates at electron densities of 10 21 cm À 3 (refs 16,17), increasing them several times over and above those that would be predicted by a more classical binary approach. As experiments using intense, short-pulse lasers to heat solid targets, as well as inertial confinement fusion investigations, routinely deal with nonequilibrium plasmas at even higher electron densities, in the range of 10 23 -10 25 cm À 3 (refs 18,19), an understanding of how collisional ionization processes are affected in a dense plasma environment is of great practical importance 20,21 .…”

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confidence: 99%

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Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

et al. 2015

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The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures B30 eV to be several times higher than that predicted by standard semiempirical models.

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confidence: 67%

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confidence: 99%

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

et al. 2015

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“…Because we do not treat electron impact ionization, our present results rather underestimate the background signal from ionized electrons (see below). We also neglect electron recombination that might attenuate the ionization [15,42,43].…”

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confidence: 99%

Incoherent x-ray scattering in single molecule imaging

et al. 2014

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Imaging of the structure of single proteins or other biomolecules with atomic resolution would be enormously beneficial to structural biology. X-ray freeelectron lasers generate highly intense and ultrashort x-ray pulses, providing a route towards imaging of single molecules with atomic resolution. The information on molecular structure is encoded in the coherent x-ray scattering signal. In contrast to crystallography there are no Bragg reflections in single molecule imaging, which means the coherent scattering is not enhanced. Consequently, a background signal from incoherent scattering deteriorates the quality of the coherent scattering signal. This background signal cannot be easily eliminated because the spectrum of incoherently scattered photons cannot be resolved by usual scattering detectors. We present an ab initio study of incoherent x-ray scattering from individual carbon atoms, including the electronic radiation damage caused by a highly intense x-ray pulse. We find that the coherent scattering pattern suffers from a significant incoherent background signal at high resolution. For high x-ray fluence the background signal becomes even dominating. Finally, based on the atomic scattering patterns, we present an estimation for the average photon count in single molecule imaging at high resolution. By varying the photon energy from 3.5 keV to 15 keV, we find that imaging at higher photon energies may improve the coherent scattering signal quality.

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Multi-electron-recombination rates estimated within dense plasmas

Cited by 2 publications

References 21 publications

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

Incoherent x-ray scattering in single molecule imaging

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