Papers › An Absorption Correction for Reliable Pair-Distribution Functions from Low Energy X-ray Sources
An Absorption Correction for Reliable Pair-Distribution Functions from Low Energy X-ray Sources
Yucong Chen, Till Schertenleib, Andrew Yang, Pascal Schouwink, Wendy L. Queen, Simon J. L. Billinge
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This paper explores the development and testing of a simple absorption correction model for processing x-ray powder diffraction data from Debye-Scherrer geometry laboratory x-ray experiments. This may be used as a pre-processing step before using PDFgetX3 to obtain reliable pair distribution functions (PDFs). The correction was found to depend only on muD, the product of the x-ray attenuation coefficient and capillary diameter. Various experimental and theoretical methods for estimating muD were explored, and the most appropriate muD values for correction were identified for different capillary diameters and x-ray beam sizes. We identify operational ranges of muD where reasonable signal to noise is possible after correction. A user-friendly software package, diffpy.labpdfproc, is presented that can help estimate muD and perform absorption corrections, with a rapid calculation for efficient processing.
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