THEORETICAL STUDY ON NEW IMAGING METHOD USING PHOTO-EXCITATION IN SOFT-X-RAY MICROSCOPY.

软X射线显微镜中光激发新成像方法的理论研究。

基本信息

批准号：
07640535
负责人：
WATANABE Tsutomu
金额：
$ 1.47万
依托单位：
INTERNATIONAL CHRISTIAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

A soft-X-ray microscope is mainly drawn attention for the reason that it can be measured biological molecules in wet states. This method is a way that shadow image of objects is obtained by making use of ionization processes of carbon and nitrogen atoms in the specimen. If we use the process of photo-excitation, the absorption cross section becoms larger by from several times to one order of the magnitude. The purpose of this research project is to investigated in theoretical way the feasibility of making images by the use of this photo-ionization processes. This project started in 1995 fiscal year and ends in 1997 fiscal year.(1) It was theoretically proved that an image of X-ray can be obtained by an inner-shell excitation from Cls to 2p^<**> orbital. This may give a theoretical foundation on recent experiments on XENES imaging change by X-ray wavelength. (2) Theoretical as well as experimental investigation on UV-visible light double resonance absorption was made for triptophan molecules. We obtained reasonable experimental results to theory. (3) Similar theoretical analysis was made in the case where UV lights were used for pumping radiation and soft X-rays are used for probe radiation. A practical calculation was made in the case of triptophan. It was shown that an image can be obtained using a commercial laser source, (4) Experiments for verification of making image by UV-Soft-X-ray double resonance absorption was made by Iketaki and Yagishita, We have made an theoretical investigation in the preparatory stage. For NO molecules, analysis for the experimental result was made. X-ray absorption spectrum was analyzed. (5) Making use of the Kramers-Kronigh relationship and using Hartree-Slater code, real part of optical constants were obtained. This will become useful for designing of multi-layr optical devises.

软X射线显微镜主要因其可以测量潮湿状态下的生物分子而受到关注。该方法是利用样品中碳原子和氮原子的电离过程获得物体阴影图像的方法。如果我们使用光激发过程，吸收截面会变大几倍到一个数量级。该研究项目的目的是从理论上研究利用这种光电离过程制作图像的可行性。该项目于1995财年开始，至1997财年结束。(1)从理论上证明了从Cls到2p^<**>轨道的内壳层激发可以获得X射线图像。这可能为最近XENES成像随X射线波长变化的实验提供理论基础。 (2)对色氨酸分子的紫外-可见光双共振吸收进行了理论和实验研究。我们得到了理论合理的实验结果。 (3)对于采用紫外光进行泵浦辐射、采用软X射线进行探测辐射的情况进行了类似的理论分析。以色氨酸为例进行了实际计算。结果表明，使用商用激光源可以获得图像。 (4) Iketaki 和 Yagishita 进行了 UV-Soft-X 射线双共振吸收成像验证实验，我们在这方面进行了理论研究。准备阶段。对于NO分子，对实验结果进行了分析。分析X射线吸收光谱。 (5)利用Kramers-Kronigh关系，利用Hartree-Slater码，得到光学常数的实部。这对于多层光学器件的设计非常有用。