Time-Resolved XUV Opacity Measurements of Warm Dense Aluminum

Vinko, S. M.; Vozda, Vojtěch; Andreasson, Jakob; Bajt, Saša; Bielecki, Johan; Burian, T.; Chalupský, J.; Ciricosta, O.; Desjarlais, M. P.; Fleckenstein, H.; Hajdu, János; Hájková, V.; Hollebon, P.; Juha, L.; Kasim, Muhammad; McBride, E. E.; Muehlig, Kerstin; Preston, Thomas R.; Rackstraw, D. S.; Roling, Sebastian; Toleikis, S.; Wark, J. S.; Zacharias, H.

doi:10.1103/physrevlett.124.225002

Cited by 22 publications

(16 citation statements)

References 33 publications

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“…We expect that our computational approach provides detailed atomic data for NLTE kinetic simulation tools, avoiding usage of standard IPD models based on LTE. It is worthwhile to note that the transient IP values reported here can be potentially measured by using singlecolor [80] and two-color [81] pump-probe schemes at XFEL facilities.…”

Section: Discussionmentioning

confidence: 99%

Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity

et al. 2021

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The advent of x-ray free-electron lasers (XFELs), which provide intense ultrashort x-ray pulses, has brought a new way of creating and analyzing hot and warm dense plasmas in the laboratory. Because of the ultrashort pulse duration, the XFEL-produced plasma will be out of equilibrium at the beginning, and even the electronic subsystem may not reach thermal equilibrium while interacting with a femtosecond timescale pulse. In the dense plasma, the ionization potential depression (IPD) induced by the plasma environment plays a crucial role for understanding and modeling microscopic dynamical processes. However, all theoretical approaches for IPD have been based on local thermal equilibrium (LTE), and it has been controversial to use LTE IPD models for the nonthermal situation. In this work, we propose a non-LTE (NLTE) approach to calculate the IPD effect by combining a quantum-mechanical electronic-structure calculation and a classical molecular dynamics simulation. This hybrid approach enables us to investigate the time evolution of ionization potentials and IPDs during and after the interaction with XFEL pulses, without the limitation of the LTE assumption. In our NLTE approach, the transient IPD values are presented as distributions evolving with time, which cannot be captured by conventional LTE-based models. The time-integrated ionization potential values are in good agreement with benchmark experimental data on solid-density aluminum plasma and other theoretical predictions based on LTE. The present work is promising to provide critical insights into nonequilibrium dynamics of dense plasma formation and thermalization induced by XFEL pulses.

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Section: Discussionmentioning

confidence: 99%

Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity

et al. 2021

View full text Add to dashboard Cite

show abstract

“…We expect that our computational approach provides detailed atomic data for NLTE kinetic simulation tools, avoiding usage of standard IPD models based on LTE. It is worthwhile to note that the transient IP values reported here can be potentially measured by using single-color [80] and two-color [81] pump-probe schemes at XFEL facilities.…”

Section: Discussionmentioning

confidence: 99%

Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity

Jin,

Abdullah,

Jurek

et al. 2021

Preprint

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The advent of x-ray free-electron lasers (XFELs), which provide intense ultrashort x-ray pulses, has brought a new way of creating and analyzing hot and warm dense plasmas in the laboratory. Because of the ultrashort pulse duration, the XFEL-produced plasma will be out of equilibrium at the beginning and even the electronic subsystem may not reach thermal equilibrium while interacting with a femtosecond time-scale pulse. In the dense plasma, the ionization potential depression (IPD) induced by the plasma environment plays a crucial role for understanding and modeling microscopic dynamical processes. However, all theoretical approaches for IPD have been based on local thermal equilibrium (LTE) and it has been controversial to use LTE IPD models for the nonthermal situation. In this work, we propose a non-LTE (NLTE) approach to calculate the IPD effect by combining a quantum-mechanical electronicstructure calculation and a classical molecular dynamics simulation. This hybrid approach enables us to investigate the time evolution of ionization potentials and IPDs during and after the interaction with XFEL pulses, without the limitation of the LTE assumption. In our NLTE approach, the transient IPD values are presented as distributions evolving with time, which cannot be captured by conventional LTE-based models. The time-integrated ionization potential values are in good agreement with benchmark experimental data on solid-density aluminum plasma and other theoretical predictions based on LTE. The present work is promising to provide critical insights into nonequilibrium dynamics of dense plasma formation and thermalization induced by XFEL pulses.

show abstract

“…This is the basic premise underlying the two-temperature model (TTM) [8]. This framework has been extensively applied to calculate the optical and thermophysical properties of laser-irradiated matter and to develop advanced models for thermal and nonthermal melting [9][10][11][12], as well as to interpret data from various experiments involving the interaction of matter with ultrashort laser pulses [13][14][15][16][17].…”

mentioning

confidence: 99%

Investigation of Nonequilibrium Electronic Dynamics of Warm Dense Copper with Femtosecond X-Ray Absorption Spectroscopy

et al. 2021

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Time-Resolved XUV Opacity Measurements of Warm Dense Aluminum

Cited by 22 publications

References 33 publications

Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity

Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity

Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity

Investigation of Nonequilibrium Electronic Dynamics of Warm Dense Copper with Femtosecond X-Ray Absorption Spectroscopy

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