Homometry in the light of coherent beams.

IF 1.8 4区材料科学

Acta Crystallographica Section A Pub Date : 2013-11-01 Epub Date: 2013-09-27 DOI:10.1107/S0108767313022733

Sylvain Ravy

引用次数: 3

Abstract

Two systems are homometric if they are indistinguishable by diffraction. A distinction is first made between Bragg and diffuse scattering homometry, and it is shown that in the last case coherent diffraction can allow the diffraction diagrams to be differentiated. The study of the Rudin-Shapiro sequence, homometric to random sequences, allows one to manipulate independently two-point and four-point correlation functions, and to show their effect on the statistics of speckle patterns. This study provides evidence that long-range order in high-order correlation functions has a measurable effect on the speckle statistics.

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相干光束的均匀性。

如果两个系统通过衍射无法区分，则它们是同规的。首先区分了布拉格散射和漫射散射的均匀性，并表明在最后一种情况下相干衍射可以使衍射图得到区分。Rudin-Shapiro序列的研究，与随机序列同源，允许人们独立地操作两点和四点相关函数，并显示它们对散斑模式统计的影响。本研究证明了高阶相关函数中的长程阶对散斑统计量具有可测量的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Crystallographica Section A 化学-晶体学

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction imaging, time-resolved studies and the structure of strain and defects in materials. The journal has two parts, a rapid-publication Advances section and the traditional Foundations section. Articles for the Advances section are of particularly high value and impact. They receive expedited treatment and may be highlighted by an accompanying scientific commentary article and a press release. Further details are given in the November 2013 Editorial. The central themes of the journal are, on the one hand, experimental and theoretical studies of the properties and arrangements of atoms, ions and molecules in condensed matter, periodic, quasiperiodic or amorphous, ideal or real, and, on the other, the theoretical and experimental aspects of the various methods to determine these properties and arrangements.