温稠密物质中不同价态离子分布对X-射线弹性散射光谱计算的影响

在天体物理和惯性约束聚变研究中涉及到的温稠密物质通常包含多种元素的混合,并且每种元素还被电离成多种离子价态,不同价态离子结构及其丰度将直接影响温稠密物质的诊断及其物理性质.同时,从电子结构计算出发来研究宏观物理性质时,还需要考虑温度、密度效应对离子结构的影响.本文从不同价态离子的电子结构计算出发,采用考虑了离子间相互作...

Influence of different charge-state ion distribution on elastic X-ray scattering in warm dense matter

The study of warm dense matter is very important for the evolution of celestial bodies and inertial confinement fusion,which often contains a mixture of multiple elements and different charge-state ions.The ionic structure and distribution of different charge-states directly affect the diagnosis and physical properties of warm dense matter.At the same time,the influence of high-temperature dense plasma on the ionic structure should be considered when we study the physical properties from the first-principle calculation of electron structure.In the present work,the radial distribution functions of multiple charge-state ions(gold,carbonhydrogen mixture,and aluminum)are developed in the hypernetted-chain approximation,and elastic x-ray scattering of different charge-state ions are calculated in the warm dense matter regime.Firstly,the electron structure of different charge-state ions is self-consistently computed in the ionic sphere,in which the ion-sphere radii are determined by the plasma density and their charges.And then the ionic fraction is obtained by solving the modified Saha equation,with the interactions among different charge-state ions taken into account,and ionion pair potentials are obtained by Yukawa model.Finally,the ion features of x-ray elastic scattering for Al are calculated on the basis of electronic distribution around the nuclei and ionic radial distribution function.By comparing the results of different charge-sate ions with the result of mean charge-sate ion,it is shown that different statistical methods can affect the physical properties which are dependent on the electronic and ionic structure.