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首页> 外文期刊>Physical review >Temperature and density dependence of XANES spectra in warm dense aluminum plasmas
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Temperature and density dependence of XANES spectra in warm dense aluminum plasmas

机译:高温致密铝等离子体中XANES光谱的温度和密度依赖性

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摘要

Using ab initio molecular-dynamics simulations combined with linear-response theory, we calculate the density and temperature dependence of the x-ray absorption near-edge structure (XANES) of a dense aluminum plasma. At solid density and for temperatures increasing up to 6 e.V, we see that the XANES spectrum loses its well-known room-temperature structure, first due to melting and second due to loss of correlation in the liquid. Similarly, as the density decreases and the system evolves from a liquid to a plasma, the XANES spectrum becomes less structured. As the density is further lowered and the system turns into an atomic fluid, a pre-edge forms as the 3p state becomes bound. We suggest that direct measurements of the XANES spectra in this density region is a unique opportunity to validate pressure ionization models routinely used in plasma physics modeling.
机译:使用从头算分子动力学模拟与线性响应理论相结合的方法,我们计算了密集铝等离子体的x射线吸收近边缘结构(XANES)的密度和温度依赖性。在固体密度下,对于高达6 e.V的温度,我们看到XANES光谱失去了众所周知的室温结构,首先是由于熔化,其次是由于液体中相关性的丧失。同样,随着密度的降低以及系统从液体演化为等离子体,XANES光谱的结构变得不那么清晰。随着密度的进一步降低和系统变成原子流体,随着3p态的结合,前缘形成。我们建议在此密度区域内直接测量XANES光谱是验证等离子体物理建模中常规使用的压力电离模型的独特机会。

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