共查询到20条相似文献,搜索用时 343 毫秒
1.
同步辐射光刻技术是X射线光刻技术的重要发展,适用于深亚微米乃至纳米级图形的 超微细加工,特别是LIGA技术的出现大大拓展了同步辐射光刻的应用领域.使它不仅适合于超大规模 集成电路等平面微结构的加工,也适合于具有复杂构造的三维立体结构和器件的制作.文章简要介绍了 NSRL光刻光束线和实验站概况及研究工作进展. 相似文献
2.
3.
同步辐射讲座第四讲同步辐射光50年 总被引:1,自引:0,他引:1
自1946年Blewett首次观察到同步辐射光至今已经55年,文章回顾了同步辐射光源的发展历史,着重介绍了同步辐射光源的性质,并简要介绍了同步辐射在生命科学、材料科学、原子分子科学、地球科学和环境科学以及工业等领域中的应用。 相似文献
4.
简要地阐述了同步辐射的优越性,介绍了国家同步辐射实验室光电子能谱站与光束线的设备,综述了国内主要用主站工作人员在金属/半导体界面等方面所开展的工作和一些结果。 相似文献
5.
光,或者更普遍地说电磁辐射,是人类观察和研究自然界所不可缺少的工具.同步辐射这种具有许多优异特性的电磁辐射更不例外,虽然发现的时间不长,却已广泛应用于许多科学和技术领域,推动了科学技术的长足进步.我国于1978年开始筹建自己的同步辐射光源──合肥国家同步辐射光源.它由一台 800MeV电子储存环和一台 200MeV直线加速器注入器组成.它于 1984年 11 月动工,1989年 4月建成出光,1991年6月调试结果,其主要性能指标已达到国际先进水平.本文重点介绍合肥国家同步辐射光源,同时还阐述同步辐射和同步辐射光源的一些基本问题. 相似文献
6.
7.
8.
9.
新一代同步辐射光源及其应用 总被引:2,自引:0,他引:2
扼要地介绍了同步辐射的历史和现状,以及在我国建设新一代同步辐射光源的必要性,设计中的上海同步辐射装置(SSRF)在其建成时将具有世界一流的光源性能,和一批覆盖面广,兼顾基础研究,应用研究和产业发展及具有世界先进水平的光束线和实验站。 相似文献
10.
11.
We demonstrate the sensitivity of X‐ray absorption fine‐structure (XAFS) measurements to the earliest stages of decomposition in Al alloys, i.e. just a few minutes after quenching. XAFS is one of the few applicable experimental approaches to this regime. Three different AlCu(Mg) samples were investigated by XAFS at the Cu K edge. Significant changes of the XAFS can be detected in the course of the decomposition in these alloys during the first 15 minutes. Actually, these changes correspond to relaxations of the nearest neighbours towards the absorbing Cu atoms. The Fourier transformation of the XAFS spectra thus leads to a pseudo radial distribution function which reflects this relaxation. In addition, XAFS measurements of the S‐phase of AlCuMg are used to decide in favour of the Perlitz and Westgren model for the S‐phase. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
12.
ZHENG Li-Rong CHE Rong-Zheng LIU Jing DU Yong-Hua ZHOU Ying-Li HU Tian-Dou 《中国物理C(英文版)》2009,33(8):701-705
X-ray absorption fine structure (XAFS) spectroscopy is a powerful technique for the investigation of the local environment around selected atoms in condensed matter. XAFS under pressure is an important method for the synchrotron source. We design a cell for a high pressure XAFS experiment. Sintered boron carbide is used as the anvils of this high pressure cell in order to obtain a full XAFS spectrum free from diffraction peaks. In addition, a hydraulic pump was adopted to make in-suit pressure modulation. High quality XAFS spectra of ZrH2 under high pressure (up to 13 Gpa) were obtained by this cell. 相似文献
13.
Nark‐Eon Sung Ik‐Jae Lee Sung‐hoon Jeong Seen‐Woong Kang 《Journal of synchrotron radiation》2014,21(6):1282-1287
An in‐vacuum undulator (IVU) with a tapered configuration was installed in the 8C nanoprobe/XAFS beamlime (BL8C) of the Pohang Light Source in Korea for hard X‐ray nanoprobe and X‐ray absorption fine‐structure (XAFS) experiments. It has been operated in planar mode for the nanoprobe experiments, while gap‐scan and tapered modes have been used alternatively for XAFS experiments. To examine the features of the BL8C IVU for XAFS experiments, spectral distributions were obtained theoretically and experimentally as functions of the gap and gap taper. Beam profiles at a cross section of the X‐ray beam were acquired using a slit to visualize the intensity distributions which depend on the gap, degree of tapering and harmonic energies. To demonstrate the effect of tapering around the lower limit of the third‐harmonic energy, V K‐edge XAFS spectra were obtained in each mode. Owing to the large X‐ray intensity variation around this energy, XAFS spectra of the planar and gap‐scan modes show considerable spectral distortions in comparison with the tapered mode. This indicates that the tapered mode, owing to the smooth X‐ray intensity profile at the expense of the highest and most stable intensity, can be an alternative for XAFS experiments where the gap‐scan mode gives a considerable intensity variation; it is also suitable for quick‐XAFS scanning. 相似文献
14.
X-ray absorption fine structure (XAFS) spectroscopy is a powerful technique for the investigation of the local environment around selected atoms in condensed matter. XAFS under pressure is an important method for the synchrotron source. We design a cell for a high pressure XAFS experiment. Sintered boron carbide is used as the anvils of this high pressure cell in order to obtain a full XAFS spectrum free from diffraction peaks. In addition, a hydraulic pump was adopted to make in-suit pressure modulation. High quality XAFS spectra of ZrH2 under high pressure (up to 13 GPa) were obtained by this cell. 相似文献
15.
The near-edge processes, such as X-ray absorption fine structure (XAFS) and resonant Raman scattering (RRS), are not incorporated
in the available theoretical attenuation coefficients, which are known to be reliable at energies away from the shell/subshell
ionization thresholds of the attenuator element. Theoretical coefficients are generally used to estimate matrix corrections
in routine quantitative elemental analysis based on various X-ray emission techniques. A tabulation of characteristic X-ray
energies across the periodic table is provided where those X-rays are expected to alter the attenuation coefficients due to
XAFS from a particular shell/subshell of the attenuator element. The influence of XAFS to the attenuation coefficient depends
upon the atomic environment and the photoelectron wave vector, i.e., difference in energies of incident X-ray and the shell/subshell
ionization threshold of the attenuator element. Further, the XAFS at a shell/subshell will significantly alter the total attenuation
coefficient if the jump ratio at that shell/subshell is large, e.g., the K shell, L3 subshell and M5 subshell. The tabulations can be considered as guidelines so as to know what can be expected due to XAFS in typical photon-induced
X-ray emission spectrometry. 相似文献
16.
Nguyen Van Hung Cu Sy Thang Nguyen Ba Duc Dinh Quoc Vuong Tong Sy Tien 《The European Physical Journal B - Condensed Matter and Complex Systems》2017,90(12):256
Thermodynamic properties, anharmonic effects and structural determination of fcc crystals have been studied based on the theoretical and experimental Debye–Waller factors presented in terms of cumulant expansion up to the third order, thermal expansion coefficient, X-ray absorption fine structure (XAFS) spectra and their Fourier transform magnitudes. The advances in these studies are performed by the further development of the anharmonic correlated Einstein model primary only for approximating three first XAFS cumulants into the method using that all the considered theoretical and experimental XAFS parameters have been provided based on only the calculated and measured second cumulants. The obtained cumulants describe the anharmonic effects in XAFS contributing to the accurate structural determination. Numerical results for Cu are found to be in good agreement with the experimental values extracted by using the present advanced method and with those obtained by the other measurements. 相似文献
17.
The 15th International Conference on X-ray Absorption Fine Structure (XAFS15) was held at the Pullman Beijing West Wanda Hotel in Beijing, China, on July 22–28, 2012. The conference was chaired by Ziyu Wu (Chinese Academy of Sciences). In conjunction with XAFS15, the workshop “XAFS theory and nano particles” was held July 18–20, 2012, in Chiba, Japan, and chaired by T. Fujikawa. 相似文献
18.
H. Ikemoto 《Journal of synchrotron radiation》2018,25(2):618-624
A new program called miXAFS for the analysis of X‐ray absorption fine‐structure (XAFS) data is presented. miXAFS can analyze the XAFS functions simultaneously for all measured X‐ray absorption edges of the constituent elements in a sample under the constraints for the structural parameters over the edges. The program provides a surface plot of the R‐factor as a function of two structural parameters, which is useful to validate the optimized structural parameters. The structural parameters can be obtained from the XAFS data in a few steps using the setting file and batch process. The program, which is coded in MATLAB and freely available, runs on Macintosh and Windows operating systems. It has a graphical user interface and loads experimental data and XAFS functions in a variety of ASCII data formats. 相似文献
19.
Development of dispersive XAFS system for analysis of time‐resolved spatial distribution of electrode reaction 下载免费PDF全文
Misaki Katayama Ryota Miyahara Toshiki Watanabe Hirona Yamagishi Shohei Yamashita Terue Kizaki Yoshimi Sugawara Yasuhiro Inada 《Journal of synchrotron radiation》2015,22(5):1227-1232
Apparatus for a technique based on the dispersive optics of X‐ray absorption fine structure (XAFS) has been developed at beamline BL‐5 of the Synchrotron Radiation Center of Ritsumeikan University. The vertical axis of the cross section of the synchrotron light is used to disperse the X‐ray energy using a cylindrical polychromator and the horizontal axis is used for the spatially resolved analysis with a pixel array detector. The vertically dispersive XAFS (VDXAFS) instrument was designed to analyze the dynamic changeover of the inhomogeneous electrode reaction of secondary batteries. The line‐shaped X‐ray beam is transmitted through the electrode sample, and then the dispersed transmitted X‐rays are detected by a two‐dimensional detector. An array of XAFS spectra in the linear footprint of the transmitted X‐ray on the sample is obtained with the time resolution of the repetition frequency of the detector. Sequential measurements of the space‐resolved XAFS data are possible with the VDXAFS instrument. The time and spatial resolutions of the VDXAFS instrument depend on the flux density of the available X‐ray beam and the size of the light source, and they were estimated as 1 s and 100 µm, respectively. The electrode reaction of the LiFePO4 lithium ion battery was analyzed during the constant current charging process and during the charging process after potential jumping. 相似文献
20.
Dongliang Chen Juncai Dong Xiaoli Zhang Peiyu Quan Yaxiang Liang Tiandou Hu Jing Liu Xiang Wu Qian Zhang Yude Li 《Journal of synchrotron radiation》2013,20(2):243-248
In combination with a single‐crystal diamond anvil cell (DAC), a polycapillary half‐lens (PHL) re‐focusing optics has been used to perform high‐pressure extended X‐ray absorption fine‐structure measurements. It is found that a large divergent X‐ray beam induced by the PHL leads the Bragg glitches from single‐crystal diamond to be broadened significantly and the intensity of the glitches to be reduced strongly so that most of the DAC glitches are efficiently suppressed. The remaining glitches can be easily removed by rotating the DAC by a few degrees with respect to the X‐ray beam. Accurate X‐ray absorption fine‐structure (XAFS) spectra of polycrystalline Ge powder with a glitch‐free energy range from ?200 to 800 eV relative to the Ge absorption edge are obtained using this method at high pressures up to 23.7 GPa, demonstrating the capability of PHL optics in eliminating the DAC glitches for high‐pressure XAFS experiments. This approach brings new possibilities to perform XAFS measurements using a DAC up to ultrahigh pressures. 相似文献