| Autor: |
Broadhurst, A., Rogers, K. D., Lowe, T. W., Lane, D. W. |
| Předmět: |
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| Zdroj: |
Acta Crystallographica: Section A (Wiley-Blackwell); Jan2005, Vol. 61 Issue 1, p139-146, 8p, 1 Diagram, 17 Graphs |
| Abstrakt: |
A direct method for determining powder diffraction data at specific depths from angle-dependent diffraction data is described. The method is non-destructive and only traditional data collections, where the angle of incidence is varied, are required. These angle-dependent spectra are transformed to give diffraction data arising from different depths, which may then be exploited using any conventional method. This is a novel approach as traditional methods are forced to tolerate the inherent depth averaging of grazing-angle diffraction, or only examine specific structural characteristics. In order to obtain depth-dependent X-ray diffraction data, a Fredholm integral equation of the first kind is solved using regularization techniques. The method has been validated by the generation of pseudo-experimental data having known depth profiles and solving the Fredholm integral equation to recover the solution. The method has also been applied to experimental data from a number of thin film systems. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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