Tracing X-ray-induced formation of warm dense gold with Boltzmann kinetic equations

0545288 - FZÚ 2022 RIV DE eng J - Journal Article
Ziaja, B. - Bekx, J.J. - Mašek, Martin - Medvedev, Nikita - Piekarz, P. - Saxena, V. - Stránský, Michal - Toleikis, S.
Tracing X-ray-induced formation of warm dense gold with Boltzmann kinetic equations.
European Physical Journal D. Roč. 75, č. 8 (2021), č. článku 224. ISSN 1434-6060. E-ISSN 1434-6079
R&D Projects: GA MŠMT LTT17015
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:68378271
Keywords : warm dense matter * creation by X-ray irradiation of bulk gold * simulations using the Boltzman kinetic eguation approach
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 1.611, year: 2021
Method of publishing: Open access

We report on the Boltzmann kinetic equation approach adapted for simulations of warm dense matter created by irradiation of bulk gold with intense ultrashort X-ray pulses. X-rays can excite inner-shell electrons, which triggers creation of deep-lying core holes. Their relaxation, especially in heavier elements such as gold (Z=79) takes complicated pathways, involving collisional processes, and leading through a large number of active configurations. This number can be so high that solving a set of evolution equations for each configuration becomes computationally inefficient, and another modeling approach should be used instead. Here, we use the earlier introduced ’predominant excitation and relaxation path’ approach. We compare the predictions with the available data from high-energy-density experiments. Their good agreement indicates ability of the Boltzmann kinetic equation approach to describe warm dense matter created from high-Z materials after their irradiation with X rays.

Permanent Link: http://hdl.handle.net/11104/0322022