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类锂硅离子软X射线激光研究 总被引:1,自引:0,他引:1
在激光等离子体典型参数条件下,利用碰撞-辐模型计算了类锂硅离子5f-3d和4f-3d跃的粒子数反转比率和激光增益系数。讨论了不同热带条件和不同冷却速度下,激光增益系统数的变化。计算结果表明,高功率,短脉冲激光生产的高温等离子体在快速冷却条件下能产生软X射的线激光增益。 相似文献
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Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak 下载免费PDF全文
In this paper,the singular value decomposition(SVD) method as a filter is applied before the tomographic inversion of soft-X-ray emission.Series of ’filtered’ signals including specific chronos and topos are obtained.(Here,chronos and topos are the decomposed spatial vectors and the decomposed temporal vectors,respectively).Given specific magnetic flux function with coupling m = 1 and m = 2 modes,the line-integrated soft-X-ray signals at all chords have been obtained.Then m = 1 and m = 2 modes have been identified by tomography of simulated ’filtered’ signals extracted by the SVD method.Finaly,using the experimental line-integrated soft-X-ray signals,m = 2 competent mode of complex magnetohydrodynamics(MHD) activities during internal soft disruption is observed.This result demonstrates that m = 2 mode plays an important role in internal disruption(Here,m is the poloidal mode number). 相似文献
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The photo-absorption cross section of aluminum was obtained from the ratio of transmission of aluminum thin-films with different area densities from 50 to 250eV with synchrotron radiation monochromatic beam. Two samples with different area densities were used to minimize the uncertainty caused by the sample surface oxidation and systematic factors of the X-ray source, beamline, and detector. The experimental results are in good agreement with the published data and FEFF program calculations in general. 相似文献
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Transmission measurement of photo-absorption cross section of aluminum in soft X-ray region of 50 to 250 eV 下载免费PDF全文
The photo-absorption cross section of aluminum was obtained from the ratio of transmission of aluminum thin-films with different area densities from 50 to 250 eV with synchrotron radiation monochromatic beam.Two samples with different area densities were used to minimize the uncertainty caused by the sample surface oxidation and systematic factors of the X-ray source,beamline,and detector.The experimental results are in good agreement with the published data and FEFF program calculations in general. 相似文献
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Various kinds of precipitates can influence the mechanical properties of Ti-stabilized steels. The qualitative composition
of the Ti inclusions can be characterized microscopically, whereas for quantitative information to be obtained time-consuming
selective dissolution must be used. The present study aims at chemical speciation of the isolated precipitates as a solid
phase with the help of soft-X-ray spectrometry. Whether the method is capable of giving both qualitative and quantitative
information on the composition of Ti-mixtures is discussed. The precipitates in Ti-stabilized steels are investigated after
chemical dissolution of the steel matrix with a bromine/methanol mixture (1:10). By combination of soft-X-ray spectrometry
with X-ray fluorescence (XRF) and scanning electron microscopy (SEM) both qualitative and quantitative characterization of
the precipitates can be performed. They were found to consist mainly of TiC and TiN.
Received July 1, 1998. Revision December 29, 1998. 相似文献
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类钠铁离子的辐射跃迁几率 总被引:1,自引:0,他引:1
本文在多组态Dirac-Fock理论框架下计算了类钠铁离子的能级及各能级n_il_i-n_kl_k,(n_i≤5,n_k≤15)间的电偶极辐射跃迁几率,证实了我们发现的新规律:在一个里德伯线系内,当上能级主量子数足够大之后,其跃迁几率仅与主量子数(不是等效主量子数)的三次方成反比。 相似文献
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在库仑-坡恩交换近似及被我们改进了屏蔽常数定义和算法的Z-标度类氢模型下,计算了类锂钙离子被电子碰撞的共振电离截面积速率系数。 相似文献
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