Properties of the dispersive double bent crystal monochromator setting with a multicrystal sandwich at the place of the second axis

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-02-09 DOI:10.3233/jnr-210032

P. Mikula, J. Šaroun, P. Strunz, V. Ryukhtin

引用次数: 0

Abstract

In this paper, some luminosity, focusing and resolution properties of a double-crystal (n,-m) dispersive setting which contains a bent perfect Si(111) crystal as a first one and a sandwich consisting of four different bent perfect crystals (BPC) Si(220), Si(400), Ge(111) and Ge(311) located at the second axis, is introduced with the aim of possible use in high-resolution diffractometry. The properties were investigated at a neutron wavelength of 0.162 nm. It was shown that a narrow and highly collimated and high-resolution monochromatic beam can be obtained. By using a standard polycrystalline pin of α-Fe, the resolution of the three-axis diffraction performance, namely, in the vicinity of the scattering angle 2 θ S = 90 ∘ was tested in detail. It has been found that the dispersive double-crystal (DC) setting represents a high-resolution monochromator alternative, e.g. in powder diffraction which could be used at high-flux neutron sources.

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第二轴处多晶夹层色散双弯晶单色仪的特性

本文介绍了一种双晶体（n，-m）色散装置的一些光度、聚焦和分辨率特性，该装置包括一个作为第一轴的完全弯曲Si（111）晶体和一个由位于第二轴的四个不同的完全弯曲晶体（BPC）Si（220）、Si（400）、Ge（111）和Ge（311）组成的夹层，目的是在高分辨率衍射中可能使用。研究了在0.162nm中子波长下的性质，结果表明，可以获得窄的、高度准直的、高分辨率的单色光束。通过使用α-Fe的标准多晶pin，详细测试了三轴衍射性能的分辨率，即在散射角2θS=90∘附近。已经发现，色散双晶体（DC）设置代表了一种高分辨率单色仪的替代方案，例如，在可用于高通量中子源的粉末衍射中。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.