通过反向蒙特卡洛分析X射线吸收数据探测固体和液体黄金的局部结构
Nodoka Hara1, Fabio Iesari2, Toshihiro Okajima2
1Physics Division, School of Science and Technologies, University of Camerino, Via Madonna delle Carceri 9, 62032 Camerino, MC, Italy.
Journal of synchrotron radiation
|February 4, 2025
概括
这项研究验证了一种用于分析扩展X射线吸收细结构 (EXAFS) 数据的新计算方法. 该RMC-GNXAS包准确地模拟了原子结构,这对于理解黄金等材料至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 计算物理 计算物理
- 射线光谱 X射线光谱
背景情况:
- 计算能力的进步使得更准确的扩展X射线吸收细结构 (EXAFS) 数据分析成为可能.
- 现有的方法需要强大的工具来建模复杂的原子结构在凝结和分子系统.
研究的目的:
- 为验证RMC-GNXAS包用于分析扩展X射线吸收细结构 (EXAFS) 数据.
- 用精确的多重散射 (MS) 模拟来研究固体和液体黄金 (Au) 的局部结构.
- 建立用于分析含有重贵族原子的功能材料的基准.
主要方法:
- 利用了RMC-GNXAS包,将逆蒙特卡洛 (RMC) 方法用于结构建模.
- 采用精确的多重散射 (MS) 模拟,包括相对论效应,以建模EXAFS信号.
- 集成的配对和三重分布函数,具有用于远程约束的互补衍射数据.
主要成果:
- 成功重建了固体和液体Au的对和三重分布函数,显示了与文献的良好一致.
- 证明了三体配置 (MS信号) 在低温下对固体Au结构的显著影响.
- 确定了液体Au的对分布函数和键角分布,识别了主导的扭曲的二面体配置.
结论:
- 包括多重散射信号在内的RMC-GNXAS方法为凝结物质提供了准确的局部结构信息.
- 固体和液体黄金表现出不同的结构特征,三体相互作用在固体阶段至关重要.
- 液态黄金的原子配置与其他密封液体中观察到的趋势保持一致,其特点是缺陷的二面体结构.
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