First-Principles Estimation of Electronic Temperature from X-Ray Thomson Scattering Spectrum of Isochorically Heated Warm Dense Matter

Chongjie Mo, Zhenguo Fu, Wei Kang, Ping Zhang, and X. T. He

Phys. Rev. Lett. 120, 205002 – Published 18 May 2018

Abstract

Through the perturbation formula of time-dependent density functional theory broadly employed in the calculation of solids, we provide a first-principles calculation of x-ray Thomson scattering spectrum of isochorically heated aluminum foil, as considered in the experiments of Sperling et al. [Phys. Rev. Lett. 115, 115001 (2015)], where ions were constrained near their lattice positions. From the calculated spectra, we find that the electronic temperature cannot exceed 2 eV, much smaller than the previous estimation of 6 eV via the detailed balance relation. Our results may well be an indication of unique electronic properties of warm dense matter, which can be further illustrated by future experiments. The lower electronic temperature predicted partially relieves the concern on the heating of x-ray free electron laser to the sample when used in structure measurement.

Received 2 August 2017
Revised 24 March 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.205002

Physics Subject Headings (PhySH)

First-principles calculations High-energy-density plasmas Plasma thermodynamics

Warm-dense matter

Approximation methods for many-body systems Density functional theory Time-dependent DFT X-ray scattering

Condensed Matter, Materials & Applied PhysicsPlasma Physics

Authors & Affiliations

Chongjie Mo^1,2, Zhenguo Fu³, Wei Kang^1,4,5,*, Ping Zhang^1,3,5,†, and X. T. He^1,3,5,‡

¹HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
²School of Physics, Peking University, Beijing 100871, China
³Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
⁴College of Engineering, Peking University, Beijing 100871, China
⁵Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China

^*weikang@pku.edu.cn
^†zhang_ping@iapcm.ac.cn
^‡xthe@iapcm.ac.cn

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Vol. 120, Iss. 20 — 18 May 2018

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