Correction of distorted X-ray absorption spectra collected with capillary sample cell  

作　　者：Hao Wang Yue-Cheng Lai Jia-Jun Zhong Yun-Peng Liu Lei Yao Li-Xiong Qian Xue-Qing Xing Zhong-Jun Chen Guang Mo Zhong-Hua Wu 

机构地区：[1]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100049,China [3]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China

出　　处：《Nuclear Science and Techniques》2023年第7期179-188,共10页核技术（英文）

基　　金：the National Key R&D Program of China(Nos.2022YFA1603802 and 2017YFA0403000);1W2B and 4B9A at the Beijing Synchrotron Radiation Facility.

摘　　要：In certain exceptional cases,capillary samples must be used to measure X-ray absorption spectra(XAS).However,the inho-mogeneous thickness of capillary samples causes XAS distortion.This study discusses the distortion and correction of the XAS curve caused by the inhomogeneous thickness of capillary samples.The relationship between the distorted XAS curveμ′d_(eq)(measured values)and the real absorption coefficientμ_(s)d_(eq)(true values)of the sample was established.The distortion was slight and negligible when the vertical size(2h)of the X-ray beam spot was smaller than 60%of the capillary tube’s inner diameter(2R_(in)).When h/R_(in)>1,X-ray leakage is inevitable and should be avoided during measurement.Partial X-ray leakage caused by an X-ray beam spot size larger than the inner diameter of the capillary tube leads to serious compressed distortion of the XAS curve.When h/R_(in)<1,the distorted XAS data were well corrected.Possible errors and their influence on the corrected XAS are also discussed.Simulations and corrections for distortions verify the feasibility and effectiveness of the corrected method.

关 键 词：XAS CAPILLARY Compression distortion CORRECTION PYTHON 

分 类 号：O434.1[机械工程—光学工程] O552.421[理学—光学]