Automated analysis of XANES: A feasibility study of Au reference compounds

Automated analysis of XANES: A feasibility study of Au reference compounds
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XANES 自动分析:Au 参考化合物的可行性研究

DOI:
10.1088/1742-6596/712/1/012070
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发表时间:
2016
期刊:
Conference Series
影响因子:
--
通讯作者:
Chang S
Chang S
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文献类型:
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作者:
Chang S

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随着高通量和成像核心级光谱(包括x射线吸收光谱,XAS,以及电子能量损失光谱,EELS)的出现,自动化数据处理,可视化和分析将成为必要。作为实现这些目标的第一步,我们研究了用MATLAB编写的简单自动化XANES峰值拟合程序的可能性和局限性,用于XANES特征的参数化,包括电离势以及电子跃迁的能量和强度。利用一系列Au L 3边XANES参考光谱,我们表明,通过应用少量规则来约束拟合,可以捕获大多数相关信息。这种策略的不确定性主要出现在电离势(IP)与弱电子跃迁或在IP以外的连续统中的特征重叠时,这可能通过多个同样好的拟合导致模糊。
With the advent of high-throughput and imaging core level spectroscopies (including X-ray absorption spectroscopy, XAS, as well as electron energy loss spectroscopy, EELS), automated data processing, visualisation and analytics will become a necessity. As a first step towards these objectives we examined the possibilities and limitations of a simple automated XANES peak fitting procedure written in MATLAB, for the parametrisation of XANES features, including ionisation potentials as well as the energies and intensities of electronic transitions. Using a series of Au L 3-edge XANES reference spectra we show that most of the relevant information can be captured through a small number of rules applied to constrain the fits. Uncertainty in this strategy arises mostly when the ionisation potential (IP) overlaps with weak electronic transitions or features in the continuum beyond the IP, which can result in ambiguity through multiple equally good fits.
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