基于X射线相干衍射成像的元素分布成像

Three-dimension elemental mapping based on coherent X-ray diffraction imaging

基于上海光源软X射线谱学显微线站的特点和相干X射线衍射成像(CDI)技术,对软X射线相干衍射成像方法的一个重要应用:元素分布成像及含量分析进行了模拟研究。推导了CDI相比双能分析算法并进行了理论模拟,估算了能够分辨的最小物质含量,并分析了CDI实验噪声等因素对元素分布成像的影响。所得结果可对软X射线CDI的实际应用提供理论指导。

Based on the characteristics of soft X-ray spectro-microseopy at Shanghai Synchrotron Radiation Facility （SSRF）, we explore in this paper the possibility of performing soft X-ray CDI （coherent X-ray diffraction imaging） for 3D elemental mapping. The dual-energy contrast analysis algorithm of CD1 is deduced. The experiment method is simulated with Fe as the element under analysis in an organic sample （with C as the major element beyond analysis）. The analysis sensitivity is estimated, and noise effect on the elemental mapping is analyzed. The results are of help in developing the soft X-ray CDI application.