Chemical Contrast in X-Ray Microscopy and Spatially Resolved XANES Spectroscopy of Organic Specimens

作者：Harald W. Ade, Xiaodong Zhang, Stephen D. Cameron, Christine A. Costello, Janos Kirz, Shawn P. Williams · 发表于：Science · 年份：1992 · DOI：10.1126/science.1439809 · 被引用次数：386 · 研究领域：Electron and X-Ray Spectroscopy Techniques、Polymer crystallization and properties、X-ray Spectroscopy and Fluorescence Analysis

The scanning transmission x-ray microscope at the National Synchrotron Light Source has been used to record x-ray absorption near-edge structure (XANES) spectra from 0.01-square-micrometer regions of organic specimens. The spectral features observed reflect the molecular structure of the dominant absorbing atoms and provide the contrast mechanism for high-resolution imaging with chemical sensitivity. This technique was used with x-ray energies near the carbon K absorption edge to identify and map separate phases in various polymer blends and to map the DNA distribution in chromosomes with a spatial resolution of 55 nanometers.