SUePDF: a program to obtain quantitative pair distribution functions from electron diffraction data

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• 作者：Dung Trung Tran ; Gunnar Svensson and Cheuk-Wai Tai
• 关键词：pair distribution functions ; electron diffraction ; transmission electron microscopy ; disorder
• 刊名：Journal of Applied Crystallography
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：50
• 期：1
• 页码：304-312
• 全文大小：1645K
• ISSN：1600-5767

文摘

SUePDF is a graphical user interface program written in MATLAB to achieve quantitative pair distribution functions (PDFs) from electron diffraction data. The program facilitates structural studies of amorphous materials and small nanoparticles using electron diffraction data from transmission electron microscopes. It is based on the physics of electron scattering as well as the total scattering methodology. A method of background modeling is introduced to treat the intensity tail of the direct beam, inelastic scattering and incoherent multiple scattering. Kinematical electron scattering intensity is scaled using the electron scattering factors. The PDFs obtained after Fourier transforms are normalized with respect to number density, nanoparticle form factor and the non-negativity of probability density. SUePDF is distributed as free software for academic users.