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Interference fringes in multiple Bragg–Laue mode

Interference fringes in multiple Bragg–Laue mode Interference fringes in multiple Bragg–Laue mode have been measured from the lateral surface of an Si plane‐parallel crystal by changing the distance L between the incident point of X‐rays and the crystal edge for two sample crystals with different thicknesses H. The period of the interference fringes becomes large when the distance L becomes large or the thickness H becomes small. When the ratio L/H is larger than 15, a shorter period of oscillation appears in addition to the interference fringes. These variations are explained by considering the beams in multiple Bragg–Laue modes based on the dynamical theory of diffraction. When L/H is less than 15, the measured fringes are well reproduced by taking account of interference between beams in the Bragg–Laue and the Bragg–Bragg–Laue modes. The short period of the oscillations observed for L/H > 15 is reproduced by adding the intensities of the beams in higher‐order Bragg–Laue mode. The interference fringes calculated by taking the visibility into account show good agreement with the measured ones. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A Foundations of Crystallography Wiley

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References (11)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S0108767310051573
pmid
21325718
Publisher site
See Article on Publisher Site

Abstract

Interference fringes in multiple Bragg–Laue mode have been measured from the lateral surface of an Si plane‐parallel crystal by changing the distance L between the incident point of X‐rays and the crystal edge for two sample crystals with different thicknesses H. The period of the interference fringes becomes large when the distance L becomes large or the thickness H becomes small. When the ratio L/H is larger than 15, a shorter period of oscillation appears in addition to the interference fringes. These variations are explained by considering the beams in multiple Bragg–Laue modes based on the dynamical theory of diffraction. When L/H is less than 15, the measured fringes are well reproduced by taking account of interference between beams in the Bragg–Laue and the Bragg–Bragg–Laue modes. The short period of the oscillations observed for L/H > 15 is reproduced by adding the intensities of the beams in higher‐order Bragg–Laue mode. The interference fringes calculated by taking the visibility into account show good agreement with the measured ones.

Journal

Acta Crystallographica Section A Foundations of CrystallographyWiley

Published: Jan 1, 2011

Keywords: ; ; ; ;

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