DARESBURY LAB (ENGLAND)*
Pagination or Media Count:
Contrast near an absorption edge has been observed in synchrotron radiation topographs obtained with white radiation due to the variation of wavelength across an image. Variations in absorption, due to the fluctuations in the EXAFS spectrum, appear as fringes parallel to the edge. The contrast has been measured densitometrically for a Nb specimen and excellent agreement obtained with a conventional EXAFS spectrum. The exposure time for the topograph was 25 s. The spectral characteristics of this technique are analysed and shown to be comparable with standard EXAFS spectroscopy. The method provides a means of extracting microstructural and spectroscopic information simultaneously and point-by-point on one sample. Possible applications are discussed.
- Properties of Metals and Alloys