<i>K</i>-shell photoabsorption edge of a dense aluminum plasma

Godwal, B. K.; Ng, A.; Silva, L. Da; Lee, Y. T.; Liberman, David A.

doi:10.1103/physreva.40.4521

Cited by 21 publications

(2 citation statements)

References 16 publications

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“…In this paper, we explore the possibility of using the structure of a photoabsorption edge to get information on the electronic and structural properties such as the pair correlation function. Previous experimental measurements [11,12] or theoretical calculations [13] of the K edge in dense compressed material have already been reported. A recent study of the K edge in dense but significantly heated Al must also be quoted [14].…”

Section: Introductionmentioning

confidence: 95%

Theoretical calculations of K-edge absorption spectra in warm dense Al

Peyrusse¹

2008

J. Phys.: Condens. Matter

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Theoretical calculations of the shape of an absorption edge in a warm dense simple material such Al are described. The calculations include the XAFS (x-ray absorption fine structure) features above the edge. The shape of these modulations relates to the atomic spatial distribution and to the electronic density of states (DOS) in the continuum. The underlying warm dense plasma model is based on a density-functional neutral pseudoatom approach which gives the radial distribution function (RDF) and the electron density around one specific site. Combined with a full multiple-scattering (MS) approach giving the final free wavefunction in a photoionization process, the model is used to predict the shape of photoabsorption K edges over a range of compression ratios from 0.5 to 3 and temperatures from 0.1 to 10 eV. It is found that XAFS structures are intense enough to be observable for densities of the order of (and above) the solid density and that dynamic or static absorption spectroscopy measurements could provide interesting information on the warm dense matter regime.

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Section: Introductionmentioning

confidence: 95%

Theoretical calculations of K-edge absorption spectra in warm dense Al

Peyrusse¹

2008

J. Phys.: Condens. Matter

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“…The broadenings and shifts of the edge reflect the electron population close to the Fermi surface and the 1s orbital energy in varied density and temperature. Till now, even for the widely invested matter of aluminum, the difference between experimental observations and theoretical predictions of the edge features obviously exists in current works [18][19][20][21][22][23][24][25][26]. Thus, an experimental study to obtain detailed experimental data and compare with theoretical simulations in an extended ρ-T domain is urgently needed.…”

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confidence: 99%

K-shell photoabsorption edge of strongly coupled aluminum driven by laser-converted radiation

Zhao

Zhang

Qing

et al. 2017

EPL

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The first observation of the K-shell photoabsorption edge of strongly coupled aluminum generated by intense x-ray radiation-driven shocks is reported. By using a "dog bone" gold hohlraum as an x-ray converter, colliding shocks compression and preheating shielding are achieved to generate an unexplored state with a density of 5.5 g/cm 3 and temperature of 0.43 eV (the ion-ion coupling parameter Γii is around 240). The time-resolved K-shell photoabsorption edges are measured with a crystal spectrometer using a short x-ray backlighter. The broadenings and redshifts of the edges are studied by using the slope fitting of the edge and quantum molecular dynamics calculations. This work shows that the K-edge of aluminum driven by laser-converted radiation provides a novel capability to probe WDM at extended conditions.

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DFT Calculations for Compressed Aluminum: (I) K-Edge Spectra of Al from Solid to Liquid to PLasma; (II) Energy Relaxation in a Two-Temperature Al-Plasma

Dharma‐wardana¹

2002

Strongly Coupled Coulomb Systems

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K-shell photoabsorption edge of a dense aluminum plasma

Cited by 21 publications

References 16 publications

Theoretical calculations of K-edge absorption spectra in warm dense Al

Theoretical calculations of K-edge absorption spectra in warm dense Al

K-shell photoabsorption edge of strongly coupled aluminum driven by laser-converted radiation

DFT Calculations for Compressed Aluminum: (I) K-Edge Spectra of Al from Solid to Liquid to PLasma; (II) Energy Relaxation in a Two-Temperature Al-Plasma

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