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The original additivity rule method cannot give good results for electron scattering from SO,SO2,SO2Cl2,SO2ClF,and SO2F2 molecules at low energy,because the electron-molecule scattering is simply reduced to electron-atom scattering.Considering the difference between the bound atom in a molecule and the corresponding free atom,the original additivity rule is revised.With the revised additivity rule,the total cross sections for electron scattering from these molecules are calculated over a wide energy range below 3000 eV and compared with the available experimental and theoretical data.A better agreement between them is obtained. 相似文献
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碘量滴定法测定过氧化氢溶液浓度的改进 总被引:17,自引:1,他引:17
研究了用碘量滴定法测定过氧化氢浓度时,试剂的加入顺序和放置时间对测定结果的影响。结果表明,在用碘量滴定法测定过氧化氢浓度的过程中,酸化条件下,I^-与H2O2反应的最佳时间为5~10min。与高锰酸钾氧化法相比,碘量法测定效果较好一些。 相似文献
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在强场图像中构造了四角对称环境中Cr2+离子包括自旋单态在内的完全能量矩阵, 通过对角化能量矩阵方法, 计算得到了BaCrSi4O10与AgGaSe2:Cr2+吸收光谱的精细结构及自旋单态对零场分裂参量的影响. 从理论上给出了BaCrSi4O10与AgGaSe2:Cr2+吸收光谱的精细结构及BaCrSi4O10的零场分裂参量值. 计算结果显示自旋单态对零场分裂参量D的影响完全可忽略, 但对a和F的影响比较大. 这种影响主要来自自旋-轨道耦合导致的自旋五重态与自旋三重态和自旋单态的相互作用, 而自旋轨道耦合的选择定则显示自旋单态并非直接影响五重态而是通过自旋三重态间接地影响基态的五重态. 因此, 为了得到准确的零场分裂参量值, 所有的自旋态都应该考虑. 相似文献
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Total cross sections for electron scattering from fluoromethanes: A revised additivity rule method
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The additivity rule for electron-molecule scattering is revised by considering the difference between the free atom and the bound atom in the molecule.The total cross sections for electron scattering from fluoromethanes(CF4,CF3H,CF2H2,and CFH3) are calculated in an energy range from 100 eV to 1500 eV by the revised additivity rule.The present calculations are compared with the original additivity rule results and the available experimental data.Better agreement with each other is obtained. 相似文献
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采用原位乳液聚合法,用十二烷基苯磺酸(DBSA)作掺杂剂和乳化剂,苯胺(AN)在聚氨酯丙烯酸酯(PUA)中聚合形成DBSA掺杂的纳米聚苯胺(PANI-DBSA)。利用红外光谱(FT-IR)、透射电镜(TEM)、四探针电导率测试仪、差热分析和粒径分析对PANI-DBSA进行了结构表征和粒径测定。结果表明:当AN为0.02mol,PUA为二甲苯(xylene)的20wt%,DBSA为总质量的13wt%,过硫酸铵为0.80mol/L,反应时间为6h,所得PANI-DBSA的电导率最大,达66.75S/m,相应的平均粒径为161nm。 相似文献
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New water soluble and photocrosslinkable prepolymers colltaining acrylate and quaternary ammonium salt groupswere synthesized from epoxy phenolic resin via ring-opening reaction with acrylic acid and with aqueous solution oftriethylamine hydrochloride successively. The second reaction needs no phase transfer catalyst to accelerate, since theproduct formed can act as a phase transfer catalyst. The prepolymer obtained contains both photocrosslinkable acrylategroups and hydrophilic quaternary ammonium salt groups. Optimum conditions for these reactions were studied. Thephotosensitivity of the prepolymer was also investigated. The effects of different photoinitiators, different crosslinkablediluent monomers and amine accelerator on the photosensitivity of the prepolymer were compared. The photoinitiator ofhydrogen abstraction type is still effective without using amine or alcohol as accelerator, because the prepolymer containsα H beside the OH groups formed in the ring-opening reactions 相似文献
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