物理学报2024，Vol.73Issue(1)：161-167,7.DOI:10.7498/aps.73.20231216
基于X射线荧光光谱的温稠密物质离化分布实验方法研究
Experimental method for warm dense matter ionization distribution based on X-ray fluorescence pectroscopy
摘要
Abstract
Warm dense matter(WDM),a state of matter that lies at the frontier between condensed matter and plasma,is one of the main research objects of high energy density physics(HEDP).Comparing with the isolated atom,the electron structure of WDM will change because of the influence of density and temperature effect.Both the accurate theoretical representation and the accurate experimental study of WDM electron structure are challenging,as it is strongly coupled and partially degenerated.In this work,an experimental method of studying the ionization distribution of WDM based on X-ray fluorescence spectroscopy is developed.In the experiment,in a specially designed hohlraum,warm and dense titanium with several tens of electron volts and nearly solid density is produced by simultaneous driving of high-energy X-ray heating and shock compression.Then,using the characteristic line spectrum emitted by the laser irradiation on pump material(Vanadium)as a pump source,the titanium emits fluorescence.The X-ray fluorescence spectra of titanium with different states(cold sample,1.8-4.5 g/cm3 and 1-25 eV)are diagnosed by changing the experimental strategy.The experimental results indicate that the line profiles of Kα and Kβ fluorescence spectrum of the heated sample change obviously compared with those of the cold sample.According to the theoretical calculation of the two-step Hartree-Fock-Slater(TSHFS)method,the main reason for the change of the line profile is the change of ionization distribution caused by temperature rising.The future work will focus on optimizing the experimental method of X-ray fluorescence spectrum,such as improving the spectrum resolution,characterizing the temperature and density experimentally,obtaining a set of ionization distribution data,and then studying the influence of dense environment on electronic structure.关键词
温稠密物质/电子结构/离化分布/X射线荧光光谱Key words
warm dense matter/electron structure/ionization distribution/X-ray fluorescence spectrum引用本文复制引用
张志宇,黄成武,朱托,宋天明,赵妍,张玉雪,张璐,李丽灵,杜华冰,车兴森,黎宇坤,赵阳,詹夏宇,杨家敏,青波,张继彦,林成亮,杨国洪,韦敏习,熊刚,吕敏..基于X射线荧光光谱的温稠密物质离化分布实验方法研究[J].物理学报,2024,73(1):161-167,7.基金项目
国家自然科学基金(批准号:12004351,11734013)资助的课题.Project supported by the National Natural Science Foundation of China(Grant Nos.12004351,11734013). （批准号:12004351,11734013）
