最新刊期
      卷 0 ， 期 0 ， 2020
      • XIE Yaning~1 HU Tiandou~1 LIU Tao~1 ZHANG Jing~1 CHEN Wenyuan~2 ZHANG Weiping~2 GAO Xueguan~3 1
        Issue 12, (2004)
        摘要：The 1W1B beamline is a newly built one dedicated to XAFS at BSRF. The commissioning work of the beamline was finished last year and all the main performances match with the design criteria. The struature and optic design of the 1W1B are discussed, and results of the performance test are also given in this paper.  
        关键词：Synchrotron radiation;XAFS;Beamline;Wiggler   
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        发布时间：2021-03-12
      • LIU Tao XUE Chao XIE Yaning HU Tiandou ZHANG Jing Wu Ziyu
        Issue 12, (2004)
        摘要：The method of quick scan XAFS was established at the XAFS station and 1W1B beamline, Beijing Synchrotron Radiation Laboratory by employing the data acquisition technique which is widely used in industrial controlling. The efficiency and feasibility of the new method was discussed in terms of its association with various factops, such as moving speed of monochromator, sampling rate of data acquisition board, and data communication mode between devices, an optimal solution to obtain QXAFS was proposed. The new method is able to collect the extended X-ray absorption spectra on a time-scale of a few tens of seconds, and even a few of seconds for the near-edge spectra, thus promising for some time-resolved in-situ experiments. As an example, the amorphous Se powders are calcinated continuously and the phase transitions were monitored and investigated by using the developed QXAFS.  
        关键词：Synchrotron radiation;QXAFS;In-situ;Data acquisition   
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        发布时间：2021-03-12
      • CHEN Xing~
        Issue 12, (2004)
        摘要：The effect of Ce-doping on microstructure of TiO2 nanoparticles is reported in this paper. The Ce-doped TiO2 samples were prepared by the sol-gel method under acidic condition and calcined at different temperatures. Influence of the cerium dose and calcination temperature on the microstructure of the TiO2 nanoparticles was studied by X-ray diffraction （XRD）, small angle X-ray scattering（SAXS） and X-ray absorption fine structure techniques. It is found that the cerium doping inhibits the growth of nanoparticles and the transformation of anatase to rutile at elevated temperature. The "self-similar" fractal structures are dependent on the Ce content and annealing temperature. The core-shell model was used to describe the near-neighbour structural parameters around Ti.  
        关键词：Ce-doping;Titanium dioxide;X-ray diffraction;Small-angle X-ray scattering;Extended X-ray absorption fine structure   
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        发布时间：2021-03-12
      • LI Xianliang~
        Issue 12, (2004)
        摘要：Microscopic local structures of Zn（Ⅱ） were studied using extended X-ray absorption fine structure （EXAFS） spectroscopy under different pH conditions. When pH<7.0, Zn2+（aq） was coordinated with six water molecules and the average Zn-O distance was measured to be 2.08A, which indicated that hydrated Zn2+（aq） ions were in octahedral geometry under acid conditions. Under alkaline conditions, Zn2+（aq） was coordinated with four water molecules and the average Zn-O distance was measured to be 1.96A, which indicated that hydrated Zn2+（aq） ions were in tetrahedral geometry. EXAFS results provided detailed information on the form and microscopic structure of hydrated Zn（Ⅱ） ions under different pH conditions, which were fundamental for understanding the reactivity of Zn（Ⅱ） in solutions and at particle-water interfaces.  
        关键词：EXAFS;Zn;Microscopic structure;pH;Adsorption   
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        发布时间：2021-03-12
      • LI Yufeng~
        Issue 12, (2004)
        摘要：Human hair samples were collected in 2000 and 2003 from mercury mine area in Wanshan, Guizhou and analyzed by measuring the amount of total mercury using hydride generation-atomic fluorescence spectrometry. Average Hg concentration in the sample was found to be 837 μg/g, much higher than those from other areas in the world, which shows a serious pollution of mercury in this area. A preliminary study was made to determine the existing states of mercury in hair samples by employing the X-ray absorption fine structure spectroscopy （XAFS）. Although the Hg concentrations in the hair samples differs from each other, the valence states and local structure of Hg remain alike in view of the results obtained from the Hg LⅢ edge XAFS spectra. The Fourier transformed spectra indicate that the existing states of Hg in hair samples is not simply an inorganic form like HgCl2 or HgO, but probably be in a more complex state. The bond lengths of Hg and coordinations are approaching for the three hair samples when considering XAFS spectra. Comparing with standard compounds, the XAFS spectra of the hair samples are most similar to Hg（GS）2, which means that the mercury in hair is more likely to bond with S as in Hg（GS）2, but more orderly.  
        关键词：Hydride generation-atomic fluorescence spectrometry;X-ray absorption fine structure spectra;Human hair;Mercury;Concentration;Wanshan   
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        发布时间：2021-03-12
      • XIE Changqing CHEN Dapeng LIU Ming YE Tianchun
        Issue 12, (2004)
        摘要：Because of its many merits, such as high resolution, large depth of focus, large field size, high throughput, large process latitude, easy extendibility to 50 nm and below ground rule, and so on, the Proximity X-ray Lithography (PXL) is very attractive for the 100 nm and smaller ground rule integrated circuit manufacturing. In this paper, the international research and development status of PXL is briefly introduced firstly, and both its application status and prospect in nanoelectronics research, Monolithic Microwave Integrated Circuits (MMIC) production and silicon-based Ultra Large Scale Integrated Circuits (ULSIC) production are described, and the recent research progress in home PXL is also presented briefly.  
        关键词：Proximity X-ray lithography;Nanoelectronics;Monolithic microwave integrated circuits;Silicon-based ultra large scale integrated circuits   
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        发布时间：2021-03-12
      • DONG Ning~1 XU Mei~1 ZHANG Weiping~1 YIN Min~1 TAO Ye~2 Makhov V N~3 Khaiduhov N M~4 Krupa J C~5 1
        Issue 12, (2004)
        摘要：Spectroscopic properties of LiKGdF5: Er（2%）, Sm（0.4%） single crystal under UV laser and synchrotron VUV light excitation were studied. The energy positions of absorption band for the 4f45d of Sm3+ and 4f105d of Er3+ ions were determined through the measurements of excitation spectra in the VUV region. The results show that when the 4f105d band of Er3+ ions was excited, quantum cutting was achieved. A model for the phenomena was also presented.  
          
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        发布时间：2021-03-12
      • TAN Weishi~
        Issue 12, (2004)
        摘要：La0.7Ca0.3MnO3（LCMO） thin films with the thickness of 500 A were deposited on（001）-oriented single crystal SrTiO3（STO）, MgO and α-Al2O3（ALO） by 90° off-axis radio frequency magnetron sputtering. Grazing incidence X-ray diffraction technique, associated with normal X-ray diffraction, was adopted to measure the in-plane lattice parameter and investigate the lattice strain and strain relaxation in LCMO films. The results indicate that critical thickness of strain relaxation is very small, which may be related to large mismatch between film and substrate. The mechanism for strain relaxation in LCMO film is perhaps different from that for tetragonal distortion. Furthermore, the in-plane growth orientation of LCMO film on STO and MgO was also studied by grazing incidence X-ray diffraction and the result is consistent with that from transmission electron microscopy.  
        关键词：La0.7Ca0.3MnO3 film;Grazing incidence X-ray diffraction;Strain relaxation;In-plane lattice parameter   
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        发布时间：2021-03-12
      • LI Haijian~1 QIN Shan~1 ZHU Xiangping~1 LIU Jing~2 LI Xiaodong~2 Wu Xiang~2 WU Ziyu~2 1
        Issue 12, (2004)
        摘要：In situ high-pressure energy dispersive X-ray diffraction experiments on natural tourmaline have been carried out using diamond anvil cell（DAC） device with synchrotron radiation source. The pressure dependence of the lattice parameters of tourmaline is reported up to 27.8 GPa at room temperature. In the experimental pressure range, we have not observed the evidence of phase transition for tourmaline. The Murnaghan equation of state is used to fit the P-V data, assuming the pressure derivative K’=4, then the isothermal bulk modulus K298=183.5±4.2 Gpa is obtained.  
        关键词：Tourmaline;Synchrotron radiation;High-pressure;Structure;Phase transition   
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        发布时间：2021-03-12
      • WU Xiang~1 QIN Shan~2 LI Xiaodong~1 LIU Jing~1 WU Ziyu~1 1
        Issue 12, (2004)
        摘要：The high-pressure room-temperature behavior of natural jadeite（NaAlSi2O6） has been studied by in situ energy dispersive X-ray diffraction measurements with synchrotron radiation and diamond anvil cell. It is found that the structure of jadeite is changed from C2/c to P21/c, then to Pbcn, and finally jadeite is transformed into NaAlSiO4 （CaFe2O4 type structure） plus stishovite at high pressure.  
        关键词：Jadeite;Pressure-induced phase transition   
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        发布时间：2021-03-12
      • XIAO Wansheng~1 LI Yanchun~2 LIU Jing~2 WENG Kenan~1 CHEN Jinyang~1 1
        Issue 12, (2004)
        摘要：The sample of cristobalite including some impure elements was obtained by heating treatment of natural Changbaishan diatomite at 1450°C for 2h, and it was confirmed to be a single phase according to the powder X-ray diffraction and FTIR results. The high-pressure and high-temperature experiment of cristobalite was carried out at a pressure up to 63 GPa by symmetrical diamond anvil cell（DAC） apparatus and synchrotron radiation energy dispersive X-ray diffraction method at BSRF. The results indicate that cristobalite underwent serial phase transformations at up to 40 GPa, and at this pressure point, the new high-pressure phase of cristobalite is similar to the α-PbO2 type structure except a diffraction line at about 0.3798 nm. The diffraction modes of a series of high-pressure metastable phases of cristobalite have the successive characteristic, which maybe reflect the fact that the original structure of cristobalite is favorable for the formation of the post-stishovite structure. The sample was heated by YLF laser to about 1600 K at 40 GPa. After heating, the sample was transformed to a new structure which was similar to the stishovite structure, and the experimental pressure was lowered to 34.8 GPa. Then the sample was pressed to 62.9 GPa, and its structure has no change. After heating to about 1500 K at this pressure, the sample has no structural transformation, and the pressure fell to 53.9 GPa. The sample still keeps the stishovite-like structure after the pressure unloaded. The experimental results maybe provide some useful hues to discuss the formation mechanism of natural SiO2 post-stishovite phases.  
        关键词：Cristobalite;High-pressure and high-temperature;Phase transformation;Metastable;Post-stishovite   
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        发布时间：2021-03-12
      • MA Maining~
        Issue 12, (2004)
        摘要：Energy dispersive X-ray powder diffraction （EDXD） of natural chromium-bearing spinel collected from Damapin using synchrotron radiation has been in situ measured under high pressure（0—12.82 GPa） and high temperature （300—603 K） conditions. Based on Mumaghan equation, the state equation of natural chromium-bearing spinel was deduced, the bulk modulus KT（0）=369 Gpa and compression coefficient K=2.713×10-3/Gpa were obtained. In addition, the thermal expansion of spinel was discused, and a thermal expansion coefficient of α=1.004×10-5/K was calculated.  
        关键词：Spinel;Diamond anvil cell;Synchrotron radiation;Energy dispersive X-ray powder diffraction   
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        发布时间：2021-03-12
      • ZHONG Jun~1 SONG Li~2 ABBAS Mamatimin~1 IBRAHIM Kurash~1 QIAN Haijie~1 XIE Sishen~2 WU Ziyu~1 1
        Issue 12, (2004)
        摘要：A study on purification process of single wall carbon nanotubes(SWCNTs) synthesized by CVD method was performed using X-ray absorption spectroscopy (XAS) and photoelectron spectroscopy. Our experimental results showed that the purification process using hydrochloric acid was effective for the removal of metal particles. We also found the chemical bonding between some chlorine ions and the carbon nanotube and suggested that this bonding effect may lead to useful chemical modification of carbon nanotubes.  
        关键词：Single wall carbon nanotubes;X-ray absorption spectroscopy;Photoelectron spectroscopy;Hydrochloric acid;Chemical modification   
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        发布时间：2021-03-12
      • ZHANG Hui WANG Baoyi ZHANG Rengang WAN Dongyun MA Chuangxin ZHOU Chunlan WEI Long
        Issue 12, (2004)
        摘要：Fe layers prepared by magnetron sputtering on Si（100） substrates have been sulfurized thermally to form FeS2 thin films at different temperatures （200—400℃） for 10 hours. The structural and surface properties of FeS2 have been studied. The results of XPS have shown that sulphur would exist at low temperature. When the iron film is sulfurized at high temperature, sulphur would change into pyrite, but small amount of sulphur would still remain on top of the film. The ratio of iron to sulphur is very close to its stoichiometric proportion according to RBS spectrum at 400℃.  
        关键词：Magnetron sputtering;Thermal sulfidation;FeS2;XPS   
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        发布时间：2021-03-12
      • MA Chuangxin ZHOU Chunlan QIN Xiubo WANG Baoyi WEI Long Kurash Ibrahim QIAN Haijie SU Run ZHONG Jun
        Issue 12, (2004)
        摘要：The distribution of tungsten ions, on the surface of and in the thermochromic and electrochromic tungsten oxides（WO3） thin films, was studied by slow positron beam and X-ray photoelectron spectroscopy. The correlations between thermochromism and electrochromism were discussed on the basis of chromogenic properties of WO3 thin films.  
        关键词：Tungsten oxide;Thermochromism;Electrochromism;Mechanism;Surface   
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        发布时间：2021-03-12
      • TANG Xiongfeng WEN Xiaojing ZHAI Xuemei YANG Miao ZHANG Xiwen WANG Wei
        Issue 12, (2004)
        摘要：Synchrotron small-angle X-ray scattering was used to investigate the ordering of quenched poly(ethylene oxide) (PEO) samples when they were heated up from room temperature to the melting point. At the temperature below 50℃, a local ordering involves the change of chain conformation in the lamellae and crystallization in the vicinity of lamellae of the areas between lamellae; while upon 50℃, a cooperative ordering occurs which includes PEO chains in disorder state crystallizing, larnellae thickening and coupling of them. While the samples were heated up to 58℃, the thin lamellae melt and then recrystallize into thick lamellae, giving rise to an increase of crystallinity.  
        关键词：Poly(ethylene oxide);SAXS;Ordering;Lamellae   
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        发布时间：2021-03-12
      • ZHU Shoumei MAO Zhenwei FENG Min ZHU Jian LING Xue
        Issue 12, (2004)
        摘要：The SRXRF line scanning analysis technique was used to measure the elements’ content in the Dilingtou Yue procelain sherd of Southern Song Dynasty from glaze to body. It is found that there exists a middle layer between the porcelain glaze and body. And a line scanning analysis comparison was made with the Ru porcelain in Northern Song Dynasty. There are some differences between them and the middle layer of Dilingtou Yue sherd is a little thinner than the Ru sherd’s. And elements’ content distributions in glaze are different from Ru porcelain’s and the changes of contents from the surface to the inner side of glaze are undulatory. The results indicate that the differences may result from the different materials of body and the different kilns.  
        关键词：SRXRF;Dilingtou Yue porcelain of Southern Song Dynasty;Line scanning analysis;Middle layer   
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        发布时间：2021-03-12
      • WEI Risheng~1 AN Lizhi~1 HUANG Yuying~2 HAN Hongmei~1 FENG Zhihui~1 ZHANG Sunxi~1 HE Wei~2 1
        Issue 12, (2004)
        摘要：To further understand the effect of La（NO3）3 on smooth muscle cell of rat for different doses and different action time, the synchrotron radiation X-ray fluorescence（SRXRF） micro-probe was used to determine the level of essential elements including P, S, K, Ca, Fe, Cu, Zn, Ni and La in single smooth muscle cell（SMC）. The change of element levels in SMC upon application of 10-4mol/L La（NO3）3 was observed. La was hardly detected in SMC before application of La（NO3）3. After application of 10-4mol/L La（NO3）3, the levels of La inside cell increased significantly and so did Ca. The levels of Ca, P, S appear to be highly correlated with the level of La in single SMC. These results suggest that La3+ could be taken up by SMC, which in turn induces change of level of intracellular essential elements. This maybe one of the machanisms by wich La3+ causes in cell proliferation and toxicity.  
        关键词：Synchrotron radiation;Lanthanum;Calcium;Smooth muscle;Single cell   
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        发布时间：2021-03-12
      • GAO Yuxi~1 CHEN Chunying~1 LI Bai~1 HUANG Yuying~2 HE Wei~2 DENG Guilong~3 LIU Yingbin~3 CHAI Zhifang~1 1
        Issue 12, (2004)
        摘要：Synchrotron radiation X-ray fluorescence(SRXRF) spectroscopy is an advanced quantitative multielemental analytical technique with space resolution of several μm and sensitivities in the μg/g range. It can be used for keeping track of trace elements in biological samples after an electrophoretic separation. In this paper, proteins in cytosol of human hepatocellular carcinoma and the surrounding "normal" tissue were separated with thin layer isoelectric focusing(IEF). The contents of metal ions in protein bands were determined by SRXRF. The results showed that the metal-containing proteins detected in the two samples were very much alike, but their distribution patterns were easily distinguishable. The contents of iron, zine, and copper in bands from the surrounding "normal" tissue were generally higher than that from hepatoma tissue, especially in Fe-eontaining proteins with pls of 6.5, 7.7, 8.0 and less than 3.5, Cu-containing proteins with pls of 3.2, 4.9, 5.5, 5.9, and 6.5, as well as Zn-containing proteins with pI of 5.5 and 6.5. However, Fe contents in Fe-containing proteins of 4.0, and 7.0 from the hepatoma tissue were slight higher than that from the surrounding "normal" tissue. Further studies are necessary to validate the universality and the biological meaning of the pattern.  
        关键词：Synchrotron radiation X-ray fluorescence;Isoelectric focusing;Metal-containing proteins;Human hepatocellular carcinoma   
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        发布时间：2021-03-12
      • GUO Hongxia~1 HAN Fubin~1 CHEN Yusheng~1 XIE Yaning~2 HUANG Yuying~2 HE Wei~2 HU Tiandou~2 WEI Ning~3 YU Lunzheng~3 1
        Issue 12, (2004)
        摘要：On the basis of study of X-ray dose enhancement effect for integrated circuits, hardening technology of secondary package shielding is proposed for typical devices. In the paper, Monte Carlo method was used for calculating the shielding effect. It has been proven that the shielding with high Z material (e.g. tungsten, tantalum) as package stuff is effective against X-ray according to the simulation results, the secondary package technology can therefore be adopted for typical semiconductor devices. Using the established test setup, an experiment on validation of this technology was made on BSRF. SRAM 62256 with different thicknesses of package material is chosen in the experiment. Tolerance X-ray dose for the IC is found to increase by one order of magnitude. The established method is very important for improving the hardening level of IC.  
        关键词：Monte Carlo simulation;Hard X-rays;Shielding;Hardening technology   
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        发布时间：2021-03-12
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