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2 results on '"Hanfei Yan"'

1. Dynamical diffraction artifacts in Laue microdiffraction images

Author

Hanfei Yan and Noyan, I.C.

Subjects
Semiconductors -- Optical properties, Crystals -- Optical properties, X-rays -- Diffraction, X-rays -- Methods, Physics
Abstract

A set of simple equations that can be used to predict the separation between the primary and secondary Laue spots as a function of sample dimensions, beam position on the sample, and incident-beam energy assuming a pseudoparallel incident beam is presented. These equations can be used to identify the peaks from the back-surface of the sample.

Published
2005

2. Coherency effects in nanobeam x-ray diffraction analysis

Author

Hanfei Yan, Kalenci, Ozgur, Noyan, I. Cevdet, and Maser, Jorg

Subjects
Yttrium -- Spectra, Yttrium -- Optical properties, Nanotechnology -- Research, X-rays -- Diffraction, X-rays -- Analysis, Physics
Abstract

The evolution of the x-ray scattering pattern forming on an area detector when a divergent, coherent nanobeam is diffracted from a perfect or weakly deformed single crystal is described. Equations are provided for an angular Fresnel number ([Y.sub.A]) in simple geometries and have shown that dynamical scattering artifacts are eliminated through wave interference in the far-field image.

Published
2008

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