Tungsten is regarded as an important candidate of plasma facing material in international thermonuclear experimental reactor （ITER）, so the determination and modeling of spectra of tungsten plasma, especially the sp...Tungsten is regarded as an important candidate of plasma facing material in international thermonuclear experimental reactor （ITER）, so the determination and modeling of spectra of tungsten plasma, especially the spectra at high temperature were intensely focused on recently. In this work, using the atomic structure code of Cowan, a collisional radiative model （CRM） based on the spin-orbit-split-arrays is developed. Based on this model, the charge state distribution of tungsten ions is determined and the soft X-ray spectra from high charged ions of tungsten at different temperatures are calculated. The results show that both the average ionization charge and line positions are well agreed with others calculations and measurements with discrepancies of less than 0.63% and 1.26%, respectively. The spectra at higher temperatures are also reported and the relationship between ion abundance and temperature is predicted in this work.展开更多
The reaction of Et4NCI, C6H5SeNa and W（CO）6 in MeCN afforded a new dinuclear tungsten（Ⅰ） complex W2（SePh）2（CO）6（MeCN）2 1 （Mr = 929.98）. The crystal structure has been determined by X-ray single-crystal di...The reaction of Et4NCI, C6H5SeNa and W（CO）6 in MeCN afforded a new dinuclear tungsten（Ⅰ） complex W2（SePh）2（CO）6（MeCN）2 1 （Mr = 929.98）. The crystal structure has been determined by X-ray single-crystal diffraction. 1 Crystallizes in monoclinic, space group P2 1/n with a = 7.501（1）, b = 18.387（2）, c = 9.491（1） A,β= 103.897（2）°, V= 1270.6（3） A^3, Z = 2, Dc = 2.431 g/cm^3, μ = 119.50 cm^-1, F（000） = 852, R = 0.0695 and wR = 0.1724 for 2220 independent reflections with 1 〉 2σ（I）. The X-ray structure analysis reveals that the W2Se2 core of 1 is planar with W-W bond length of 3.0433（13） A and W-Se of 2.5922（17）A.展开更多
With an attempt to investigate the effect of gold impurity and tungsten oxide on the recombination and separation of electron hole pairs, and disclose the effect of surface state on the photo catalytic activity of TiO...With an attempt to investigate the effect of gold impurity and tungsten oxide on the recombination and separation of electron hole pairs, and disclose the effect of surface state on the photo catalytic activity of TiO 2, an innovative photo catalyst 3%WO 3/0.5%Au 3+ /TiO 2 was prepared by means of sol gel method. The photo oxidation efficiency of photo catalyst was evaluated by conducting a set of experiments to photo degrade methylene blue (MB) in aqueous solution. The surface state properties were examined by means of surface photovoltage spectra (SPS) and electron field induced SPS (EFISPS). The experiments demonstrate that the strongest peak is attributed to electron excited from valence band to conduction band and the second strongest peak is attributed to electron excited from valence band to oxygen molecular for all samples. Electron is trapped by O 2 absorbed on the surface of TiO 2. And the surface state of O - 2 forms. For (1%, 3%)Au 3+ /TiO 2 sample, two new peaks that significantly present at 414?nm and 400?nm respectively should be attributable to gold impurity energy level. And for tungsten oxides doping samples, 4 peaks that significantly present in the region of 500～800?nm should be attributable to tungsten impurity energy level. The intensity of EFISPS decreases with increasing the content of gold ion or tungsten oxide when its content is no more than their optimal dosage. However, when the content of gold ion or tungsten oxide is more than their optimal dosage, impurity energy level becomes recombination center from separation center and the intensity of all peaks increases for them.展开更多
Reaction of Et 4NCl, NaSCH 2COOMe and W(CO) 6 in MeCN affords a new dinuclear tungsten(0) complex Et 4N 2 W 2(CO) 8(SCH 2COOMe) 2 (1). The crystal and molecular structure has been determined by X ray ...Reaction of Et 4NCl, NaSCH 2COOMe and W(CO) 6 in MeCN affords a new dinuclear tungsten(0) complex Et 4N 2 W 2(CO) 8(SCH 2COOMe) 2 (1). The crystal and molecular structure has been determined by X ray single crystal diffraction. 1 Crystallized in the triclinic, space group P 1 with a=11.141(7), b=10.267(4), c=10.798(3) ; α=93.96(3), β=96.88(4), γ=114.97(5)°; V=1003 3, Z=1, D c =1.76 g/cm 3, μ =60.1 cm -1 , R =0.042 and R w =0.050 for 2967 independent reflections with I】3.0 σ(I) . 1 contains a WS 2W planar core with nonbonding W…W distance of 3.9611(5) , and its IR, 13 C NMR, and cyclic voltammetry were measured and discussed.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.11074176)the Science Foundation of College of Science,Sichuan University of Science and Engineering,China(Grant No.10LXYA01)
文摘Tungsten is regarded as an important candidate of plasma facing material in international thermonuclear experimental reactor （ITER）, so the determination and modeling of spectra of tungsten plasma, especially the spectra at high temperature were intensely focused on recently. In this work, using the atomic structure code of Cowan, a collisional radiative model （CRM） based on the spin-orbit-split-arrays is developed. Based on this model, the charge state distribution of tungsten ions is determined and the soft X-ray spectra from high charged ions of tungsten at different temperatures are calculated. The results show that both the average ionization charge and line positions are well agreed with others calculations and measurements with discrepancies of less than 0.63% and 1.26%, respectively. The spectra at higher temperatures are also reported and the relationship between ion abundance and temperature is predicted in this work.
文摘The reaction of Et4NCI, C6H5SeNa and W（CO）6 in MeCN afforded a new dinuclear tungsten（Ⅰ） complex W2（SePh）2（CO）6（MeCN）2 1 （Mr = 929.98）. The crystal structure has been determined by X-ray single-crystal diffraction. 1 Crystallizes in monoclinic, space group P2 1/n with a = 7.501（1）, b = 18.387（2）, c = 9.491（1） A,β= 103.897（2）°, V= 1270.6（3） A^3, Z = 2, Dc = 2.431 g/cm^3, μ = 119.50 cm^-1, F（000） = 852, R = 0.0695 and wR = 0.1724 for 2220 independent reflections with 1 〉 2σ（I）. The X-ray structure analysis reveals that the W2Se2 core of 1 is planar with W-W bond length of 3.0433（13） A and W-Se of 2.5922（17）A.
文摘介绍了东方超环(experimental advanced supereonducting tokamak, EAST)托卡马克上的两套快速极紫外(EUV)光谱仪系统波长的原位标定方法、结果及其应用。这两套谱仪均为掠入射平场谱仪,时间分辨均为5 ms·frame -1 。两套谱仪分别工作在20~500和10~130 的波段范围,由步进电机控制探测器在焦平面上移动实现整个观测波段上的波长扫描。利用这两套谱仪系统观测极紫外波段光谱,计算EAST中低-高Z杂质离子特征线辐射强度随时间的演化,监测和研究等离子体中杂质的行为。高Z杂质尤其是钨、钼等金属元素,发出的EUV波段光谱的构成非常复杂,准确识谱对谱仪精确的波长测量能力以及谱分辨能力要求很高,因此精确的波长标定是识别钨、钼等高Z杂质谱线以及研究它们行为的最关键的技术之一。利用EAST等离子体中类氢到类铍的低、中Z杂质的特征谱线以及它们的二阶甚至三阶谱线,结合谱仪系统的色散能力,对这两套快速极紫外光谱仪的波长进行了精确的原位标定。用于波长标定的杂质谱线有O Ⅷ 18.97 , O Ⅶ 21.60 , C Ⅵ 33.73 , Li Ⅲ 113.9 , Li Ⅲ 135.0 , Li Ⅱ 199.28 , Ar ⅩⅤ 221.15 , He Ⅱ 256.317 , He Ⅱ 303.78 , Ar ⅩⅥ 353.853 及C Ⅳ 384.174 等。利用波长标定的结果对观测到的EUV光谱进行谱线识别,两套谱仪观测到的绝大多数谱线波长与美国技术标准局(National Institute of Standards and Technology, NIST)数据库的标准波长相差分别小于0.08和0.03 。开发了谱仪波长原位标定程序模块,将这个模块内嵌到谱仪数据实时上传的交互式软件中,实现了全谱数据以及特征谱线强度随时间演化数据的实时处理和上传。同时利用开发的全谱分析交互式软件以及EAST上的数据查看软件,最终实现了快速EUV谱仪自采数据的准实时分析、读取和查看。
文摘With an attempt to investigate the effect of gold impurity and tungsten oxide on the recombination and separation of electron hole pairs, and disclose the effect of surface state on the photo catalytic activity of TiO 2, an innovative photo catalyst 3%WO 3/0.5%Au 3+ /TiO 2 was prepared by means of sol gel method. The photo oxidation efficiency of photo catalyst was evaluated by conducting a set of experiments to photo degrade methylene blue (MB) in aqueous solution. The surface state properties were examined by means of surface photovoltage spectra (SPS) and electron field induced SPS (EFISPS). The experiments demonstrate that the strongest peak is attributed to electron excited from valence band to conduction band and the second strongest peak is attributed to electron excited from valence band to oxygen molecular for all samples. Electron is trapped by O 2 absorbed on the surface of TiO 2. And the surface state of O - 2 forms. For (1%, 3%)Au 3+ /TiO 2 sample, two new peaks that significantly present at 414?nm and 400?nm respectively should be attributable to gold impurity energy level. And for tungsten oxides doping samples, 4 peaks that significantly present in the region of 500～800?nm should be attributable to tungsten impurity energy level. The intensity of EFISPS decreases with increasing the content of gold ion or tungsten oxide when its content is no more than their optimal dosage. However, when the content of gold ion or tungsten oxide is more than their optimal dosage, impurity energy level becomes recombination center from separation center and the intensity of all peaks increases for them.
文摘Reaction of Et 4NCl, NaSCH 2COOMe and W(CO) 6 in MeCN affords a new dinuclear tungsten(0) complex Et 4N 2 W 2(CO) 8(SCH 2COOMe) 2 (1). The crystal and molecular structure has been determined by X ray single crystal diffraction. 1 Crystallized in the triclinic, space group P 1 with a=11.141(7), b=10.267(4), c=10.798(3) ; α=93.96(3), β=96.88(4), γ=114.97(5)°; V=1003 3, Z=1, D c =1.76 g/cm 3, μ =60.1 cm -1 , R =0.042 and R w =0.050 for 2967 independent reflections with I】3.0 σ(I) . 1 contains a WS 2W planar core with nonbonding W…W distance of 3.9611(5) , and its IR, 13 C NMR, and cyclic voltammetry were measured and discussed.
