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受温度及密度等环境效应影响，温稠密物质的电子结构显著变化，其理论描述非常复杂，精密实验测量亦非常困难。本文发展了基于X射线荧光光谱研究温稠密物质离化分布的实验方法，结合理论研究有助于深入理解温稠密物质的电子结构变化。在万焦耳激光装置上，设计特殊构型黑腔复合加载产生数十eV、近固体密度的稠密Ti物质，利用激光辐照V产生的热发射线泵浦Ti的荧光并采用晶体谱仪诊断样品的X射线荧光光谱。实验中获得冷样品和加载样品的荧光光谱，观测到加载样品Kα及Kβ荧光谱线相对于冷样品光谱在高能侧的显著变化，结合理论计算解释了加载样品荧光谱线的变化主要来源于其温度上升后离化分布的改变，建立了基于X射线荧光光谱的温稠密物质离化分布实验研究能力。Warm dense matter (WDM), a state of matter which lies at the frontiers between condensed matter and plasma, is one of the main research objects of high energy density physics (HEDP). Compared to the isolated atom, the electron structure of WDM will change because of the influence of density and temperature effect. Both the accurate theoretical represent and the accurate experimental study of WDM electron structure are challenging, as it is strongly coupled and partially degenerated. In this paper, an experimental method for studying the ionization distribution of warm dense matter based on x-ray fluorescence spectroscopy is developed. In the experiment, warm dense titanium with several tens eV and near solid density is created by a simultaneous drive from high energy xray heating and shock compression in a special designed hohlraum. Then, using the characteristic line spectrum emitted by the laser irradiation on pump material (Vanadium) as pump source, the titanium emits fluorescence. The x-ray fluorescence spectroscopy of titanium with different states (cold sample, 1.8-4.5 g/cm3 and 1-25 eV) is 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 relative to that of the cold sample. Associating a theoretical calculation from two-step Hartree-Fock-Slater (TSHFS) method, the reason for the variation of the line profile is the change of ionization distribution mainly caused by temperature rise. The future work will focus on optimizing the experimental method of x-ray fluorescence spectroscopy, such as improving the spectrum resolution, characterizing the temperature and density experimentally, obtaining a set of ionization distribution data, and then study the influence of dense environment on electronic structure.
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Keywords:
- warm dense matter /
- electron structure /
- ionization distribution /
- x-ray fluorescence spectrum
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