最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Yuxuan JIANG Shiping ZHANG Xinyi
        Issue 7, (2001)
        摘要：The relationship between the photon flux and the wave length of the soft X - ray beamline in Hefei Light Source (HLS) was calculated. The photocurrent was measured by an AXUV photo diode when a condense zone plate of CZP32 type and a pinhole of 30 microns were adopted by the monochromator. Accoding to the photocurrent and the quantum efficiency of the diode, the absolute photon flux outside the vacuum separation window in a range of 2. 8 nm to 3. 9 nm was measured to be 2. 7 ×105-8. 0 ×105 photons/(s. mA·0. 1nmBW). By theoretical calculation, It was found that the photon flux inside the vacuum chamber was about 107 photons(s·mA·0. 1nmBW), which was two orders higher than the value outside.  
        关键词：Soft X-ray;Monochromator;Photon flux;Water window   
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        发布时间：2021-03-12
      • YU Xiaojiang WANG Qiuping XU Faqiang PAN Haibin XU Pengshou
        Issue 7, (2001)
        摘要：The resolution of monochromator becomes much higher with the development of synchrotron radiation beamline technology, it demands high performance of control software to drive the complex configuration of mechanical rotation and translation. On the other hand, with the number of the constructed beamlines increases rapidly, it imposes a large force on developing, a migrated and standard control software. A multi - layer technology introduced to variable angle spherical grating monochromator (VASGM) control in which the layers being inter - connected by Ethernet was discussed. The lower layer, a hardware abstract layer, operates the hardware directly and the top layer, a graphic user interface, processes the user’s command and passes corresponding operation to the lower layer. The top layer can be flexibly connected with different control software. A numeric solution of VASCM was also given.  
        关键词：Synchrotron radiation;Soft x-ray monochromator;Delamination technology;Control software   
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        发布时间：2021-03-12
      • CUI Hongbin LIU Wenhan
        Issue 7, (2001)
        摘要：The diffuse properties and combination methods of monochromator by combined multilayer multilayergrating in soft X - ray region were deduced on the basis of diffraction properties of multilayers and multilayer - gratings. If there is an appropriate angle, which is determined by the periods of the elements between reflection faces of multilayer and multilayer - gratings, the monochromator can afford higher resolution homogeneous light beam which is parallel to incident rays.  
        关键词：Soft X-ray;Multilayer;Multilayer-grating;Monochromator   
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        发布时间：2021-03-12
      • XIAO Tiqiao
        Issue 7, (2001)
        摘要：A focused beam in nanometer scale is important for soft X - ray scanning microscopy and microscopic spectroscopy. A plan has been proposed to realize diffraction - limited focusing of X - ray, during the construction of synchrotron radiation beamline. In this design, light source from undulator radiation, with high coherent flux, is employed. A zone plate, a kind of diffraction optical element, is used to focus the soft X - ray beam into diffraction - limited spot. A concept of redundant illumination is introduced to ensure the spatial coherent illumination of the imaging element. In order to improve the output, special consideration is posed to phase space matching in horizontal and vertical directions. The designed focus spot size is 50nm, flux output is 109photons/s·0. 1% BW.  
        关键词：Synchrotron radiation;X-ray microscopy;Zone plate;Spatial coherence   
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        发布时间：2021-03-12
      • ZHANG Guobin SHI Junyan HAN Zhengfu ZHOU Yingxue SHI Chaoshu ZHANG Xinyi
        Issue 7, (2001)
        摘要：The design of a new beamline was introduced, which will be used for Circular - Dichroism and Photoacoustic spectroscopy at National Synchrotron Radiation Laboratory. An improved normal incident monochromator was adopted in the design. The beamline includes a prefocusing cylindrical mirror and a cylindrical guting, but no entrance slit. The mirror will accept a very large proportion of the dipole radiation (8 mrad of vertical beam, .and 40 mrad of horizontally), and focus the source sagittally on exit slit. The cylindrical grating will focus meridionally the source on the sample position, besides dispersion. The characteristics of such design are high flux (1012-1013 photons/s), moderate resolution (0. 3-5nm), reserving the linear polarization. A valve with LiF (or GaF2 ) window will be used to separate the beamline and experimental station. The beamline will be in ultra - high vacuum, but the experimental station will be N2 (or He) purged.  
        关键词：Synchrotron radiation;Beamline;Circular - dichroism;Photoacoustic spectroscopy   
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        发布时间：2021-03-12
      • CHEN Qiang WANG Qiuping YU Xiaojiang ZHOU Hongjun
        Issue 7, (2001)
        摘要：The groove density parameters are important to VLS plane gratings monochromator. It is necesary to make sure that the parameters were specified and their errors were acceptable. A diffraction method was used to measure the groove density of VLS grating for system. It included a light source (He - Ne laser), a collimator, a goniometer with angle encoder, a autocollimator, a linear stages, a detector(CCD) and the guting to be tested. The main error sources in the measuring system were analyzed in details. It turned out that the measuring system proposed was adequated for our purpose. A compensation method was analyzed for the monochromator if the groove density parameters were deviated from the design value.  
        关键词：VLS plane grating;Groove density;Monochromator   
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        发布时间：2021-03-12
      • ZHOU Yingxue WANG Dongsheng ZHANG Xinyi
        Issue 7, (2001)
        摘要：The luminescence centered at about 390nm due to 4f65d→4f7 transition of Eu2+ can be observed without X - ray or UV - light pre - irradiation for BaFBr: Eu2+、Ba0.95Sr0.05 FBr: Eu2 + and Ba0.95Ca0.05FBr: Eu2+ powder samples which can be excited by light with wave length longer than 400nm. It could be attributed to F centers which are formed in the preparation of samples. There are two broad bands in the photo - stimulated spectra. One peaked at 535nm results from the excitation of electrons at F(F- ) center, and the other at 708nm might be originated from the electron excitation of F(Br- ) center or F(Br- ) accumulators. If the Ba2+ (ion’s radius equals to 0. 135nm) in the samples were replaced by about 50% mol. of Sr2 + (ion’s radius equals to 0. 113nm) or Ca2 + (ion ’s radius equals to 0. 099nm), the intensities of 535nm and 708nm bands decrease with the decrease of ion radius. On the other hand, the shoulders at 580nm and 650nm or 575nm and 645nm can appeare. In absorption spectra of 50 - 400nm range, one can observe the red - shift of 79nm, 83nm peaks and new absorption peaks. It means that the new color centers: F(F -, Sr2 + ) .F(Br-, Sr2 + ) or F(F-,Ca2+ ) .F(Br-, Ca2+ ) are formed, when Ba2+ were replaced with Sr2+ or Ca2+ in samples. It corresponds to the shoulders in photo - stimulated spectra.  
          
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        发布时间：2021-03-12
      • TANG Yuguo WANG Zhaolan LU Qipeng XUE Song
        Issue 7, (2001)
        摘要：In this paper, the research work of spectral radiometric standards established by using synchrotron radiation has been reviewed. The radiometric transfer standard sources were briefly described, Finally the method of calibration was introduced.  
        关键词：Synchrotron radiation;Radiometric standards   
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        发布时间：2021-03-12
      • LIU Shaoyi XU Chaoyin PAN Guoqiang WANG Feng ZHAO Dianming
        Issue 7, (2001)
        摘要：A cylindrical mirror bent to the toroidal shape with a special mechanism is used to focus the Sychrotron radiation in both horizontal and vertical directions at the X - ray beamline. The surface characters of the bent mirror mostly impairs the focused spot on the sample. The X - ray diffraction beamline of NSRL will be equipped with a toridal mirror, of which the cylindrical mirror is made in the ZIESS Company of Germany and the bender mechanism is developed by NSRL. This paper describes the adjustment of the bent mirror and presents the measuring rustles on the radius of curvatures, the slope errors, plofile and shape errors at the tong trace profiler (LTP) of ESRF (France).  
        关键词：Synchrotron radiation;Toridal mirror;Shape errors   
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        发布时间：2021-03-12
      • WU Guohua BABA Yuji SHENG Liusi ZHANG Yunwu
        Issue 7, (2001)
        摘要：The resonant photoexcitation of some core - levels can be carried out by using energy - tunable synchrotron radiation soft X - ray. The core excited state decays mainly through spectator Auger transition after the electrons are resonantly photoexcited into unoccupied orbitals. Because the excited electron just stays in the unoccupied orbital generally with antibonding character in the spectator Auger processes, this kind of excited state of a molecule goes into a steep repulsive potential curve, so it is very important for specific ion desorption. Generally speaking, antibonding orbital is located on the given bond, so the resonant excitation can result in bond - specific rupture and ion desorption. This process will cut some special fragment from adsorbates just like a " chemical scissors". Some examples of photon - stimulated ion desorption by core - to - valence resonant excitation have been presented in this paper. The mechanisms in the processes were also explained.  
        关键词：Soft X-ray;Synchrotron radiation;Photon-stimulated ion desorption   
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        发布时间：2021-03-12
      • LI Chengxiang WU Guohua LIU Fuyi SHENG Liusi
        Issue 7, (2001)
        摘要：The infrared beamline and station of national synchrotron radiation laboratory, including the source, beamline, station instruments, and infrared synchrotron radiation application on high resolution spectroscopy, iifrared microscope and surface science were briefly introduced.  
        关键词：Infrared synchrotron radiation;Relative brightness;Fourier transform spectroscopy   
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        发布时间：2021-03-12
      • WANG Jie ZHOU Yingxue
        Issue 7, (2001)
        摘要：Basic concepts and applications about XMCD absorption spectroscopy were reviewed. One may deduce the spin magnetic moments, orbital magnetic moments and magnetic structure anisotropies of magnetic elements according to sum rules of XMCD. Magnetic films, ultra - thin films and sandwich films can be studied by XMCD, in which there are distinguishing features from that of bulk samples. By now, XMCD has combined with other techniques, such as, microscopy, EXAFS/XAFS, to extend magnetic researches. The design of the beamline and endstation of soft X ray magnetic circular dichroism at the National Synchrotron Radiation Laboratory and its present development were introduced.  
        关键词：X ray absorption;XMCD;Synchrotron radiation;Polarization   
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        发布时间：2021-03-12
      • GAO Hongyi CHEN Jianwen XIE Honglan LU Peixiang XU Zhichan JIANG Shiping ZHANG Xinyi
        Issue 7, (2001)
        摘要：Several factors effecting the resolution of soft X - ray microscopic imaging by contact process were discussed. These main factors included damages during recording, subsequent errors brought by equipment in magnifying and reading and Fresnel knife - edges diffraction etc. Some practical methods were suggested for improvement of the resolution.  
        关键词：Soft X-ray;Microscopic contact imaging;Resolution   
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        发布时间：2021-03-12
      • XIE Suyuan PENG Yin LIN Xinhua HUANG Rongbin ZHENG Lansun
        Issue 7, (2001)
        摘要：A series of fullerene derivatives would be produced by the laser induced reaction of C60 with toluene. High performance liquid chromatography combined with mass spectrometry and ultraviolet spectrometry (HPLC - MS - UV) was developed for separation and characterization of the reaction products, comprising C60(C7H7 )n, C60Hn and C60(C7 H7 )nOm. The derivation might be related to the radical intermediates from laser reaction of toluene. Tandem mass spectra(MS/MS) revealed that the intermediates were bonded at the rim of C60 to form derivatives)  
        关键词：C60;Laser induced reaction;HPLC   
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        发布时间：2021-03-12
      • XU Changshan
        Issue 7, (2001)
        摘要：By analyzing the experimental results of heating, X - ray photoelectron spectroscopy (XPS) and synchrotron radiation photoelectron spectroscopy (SRPES), the results suggested that there should be some micro - tunnels in highly compressed Ag nano - crystalline materials.  
        关键词：Photoelectron spectroscopy;Nanocrystalline;Ag   
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        发布时间：2021-03-12
      • WANG Wenfeng YAO Side
        Issue 7, (2001)
        摘要：The photochemistry of 2’- acetonaphthone in acetonitril. has been investigated using laser flash photolysis. The triplet - triplet absorption spectrum of 2’- acetonaphthone studied show absorption maximum at 420nm with extinction coefficient of 9500dm3mol-1 cm-1. The triplet half - life times is 11. 0μs in 3 ×10 -3mol·dm -3 2’- acetonaphthone solution. The triplet quantum yield and the singlet oxygen quantum yield of 1. 0 and 0. 71 were obtained respectively. A rate constant for triplet energy transfer between benzophenone triplet and 2 ’- acetonaphthone is 1. 0 ×1010 dm3 mol -1·s -1.  
        关键词：2’-acetonaphthone;Triplet;Quantum yield;Singlet oxygen   
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        发布时间：2021-03-12
      • SHEN Wenqing ZHU Zhiyuan ZHANG Huyong
        Issue 7, (2001)
        摘要：Some basic theories for heavy ion collisions at intermediate energy were reviewed, meanwhile some focus points of heavy ion collisions at intermediate energy such as the liquid gas phase transition of nuclear matter, collective flow, multi - fragmentation, the equation of state, nucleon - nucleon interaction cross section in the media and isospin effects were also discussed. The perspective of heavy ion collisions at intermediate energy was introduced briefly.  
        关键词：Equation of state;liquid gas phase transition;Collective flow;Multi- fragmentation;Isospin effects   
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        发布时间：2021-03-12
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