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Development and application of crystal structure analysis technology with polarized X-ray multiple wave method

偏振X射线多重波法晶体结构分析技术的开发与应用

基本信息

批准号：
18540310
负责人：
OKITSU Kouhei
金额：
$ 1.82万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Takagi-Taupin equation (T-T theory) has been widely known since its derivation by Takagi as an X-ray dynamical diffraction theory that can deal with wave fields in a deformed crystal. The Ewald-Laue dynamical theory (E-L theory) has been considered as an principle X-ray dynamical diffraction theory while the T-T theory has been considered to be a special theory However, it should be noted that the E-L and T-T theories are equivalent to each other. The T-T theory describes the X-ray wave fields in a crystal in the real space while the E-L theory describes those in the reciprocal space. The E-L theory was extended to three-beam case in the late 1969's and a numerical method to solve it was given by Colella in 1974. However, the T-T theory has been considered not able to be solved for multiple wave condition until the present author gave a numerical method to solve it for multiple wave cases.Furthermore, the T-T theory can be solved numerically but only for plane-wave and spherical wave X-ray incidence condition but also for an arbitrary X-ray incidence condition. Recently Ando and his coworkers studies on refraction contrast imaging using an analyzer crystal that can obtain clear images even when normal absorption images cannot be obtained at all due to the faint absorption inhomogeneity of object. In 2007 fiscal year, the present author made a study focusing on computer simulation of refraction contrast imaging. The computer-simulated refraction contrast images well agreed with practical images obtained by experiments. Therefore, it has come to be able to evaluate favorable condition required to the analyzer crystal. Further, X-ray refraction computed tomography (CT) and tomothynthes images that can be obtained by rotating the object, can be expected before experiment. This simulation was performed by taking advantage of the feature of T-T equation that can deal with an arbitrary incidence condition of X-rays.

自从Takagi-Taupin方程（T-T理论）被Takagi-Taupin提出以来，它作为一种能处理变形晶体中波场的X射线动力学衍射理论而广为人知。Ewald-Laue动力学理论（E-L理论）一直被认为是X射线动力学衍射的基本理论，而T-T理论一直被认为是一种特殊的理论。T-T理论描述的是真实的空间中的X射线场，而E-L理论描述的是倒易空间中的X射线场。1969年后期，E-L理论被推广到三束情况，Colella于1974年给出了一种数值方法。然而，T-T理论一直被认为不能求解多波情况，直到本文作者给出了一种数值方法来求解多波情况，而且T-T理论不仅可以数值求解平面波和球面波X射线入射情况，而且可以数值求解任意X射线入射情况。最近，Ando和他的同事们研究了使用分析晶体的折射衬度成像，该分析晶体即使由于物体的微弱吸收不均匀性而无法获得正常吸收图像，也可以获得清晰的图像。在2007财年，本作者进行了重点研究折射对比成像的计算机模拟。计算机模拟的折射衬度图像与实验获得的实际图像吻合较好。因此，能够评估分析晶体所需的有利条件。此外，可以在实验之前预期可以通过旋转对象获得X射线折射计算机断层摄影（CT）和断层摄影图像。利用T-T方程可以处理任意X射线入射条件的特点进行了模拟。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

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DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

「研究成果報告書概要(和文)」より

摘自《研究结果报告摘要（日文）》

DOI：
发表时间：
2005
期刊：
影响因子：
0
作者：
Kawauchi;et. al.;Nishimura et al.;Dezawa et al.;Yoshizawa et al.;星野幹雄;星野幹雄
通讯作者：
星野幹雄

Polarization-dependent six-beam X-ray pinhole topographs

偏振相关六光束 X 射线针孔形貌图

DOI：
发表时间：
2006
期刊：
Acta Cryst. A 62
影响因子：
0
作者：
Kouhei Okitsu;Yoshitaka Yoda;Yasuhiko Imai;Yoshinori Ueji;Yuta Urano and Xiao Wei Zhang
通讯作者：
Yuta Urano and Xiao Wei Zhang

Poloarization-dependent six-beam X-ray pinhole topographs

偏振相关六束 X 射线针孔形貌图