First-Principles Estimation of Electronic Temperature from X-Ray Thomson Scattering Spectrum of Isochorically Heated Warm Dense Matter
First-Principles Estimation of Electronic Temperature from X-Ray Thomson Scattering Spectrum of Isochorically Heated Warm Dense Matter
复制标题
根据等容加热温稠密物质的 X 射线汤姆逊散射谱第一性原理估算电子温度
DOI：
10.1103/physrevlett.120.205002
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发表时间：
2018
影响因子：
8.6
通讯作者：
He X. T.
中科院分区：
文献类型：
--
作者：
Mo Chongjie;Fu Zhenguo;Kang Wei;Zhang Ping;He X. T.
通过固体计算中广泛使用的随时间密度泛函理论的摄动公式，我们提供了在Sperlinget等人的实验中考虑的等等温加热铝箔的x射线汤姆森散射谱的第一性原理计算。[j] .光子学报，2015,(1)[j] .光子学报，2015,[j] .光子学报，2015,[j] .光子学报。从计算的光谱中，我们发现电子温度不能超过2 eV，远小于之前通过详细的平衡关系估计的6 eV。我们的结果很可能是热致密物质独特的电子特性的一个指示，这可以在未来的实验中进一步说明。预测的电子温度较低，部分缓解了x射线自由电子激光在结构测量中对样品加热的担忧。
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 Sperlinget al.[Phys. Rev. Lett. 115, 115001 (2015)PRLTAO0031-900710.1103/PhysRevLett.115.115001], 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.