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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
It is demonstrated that the difference in magnitude between these two bonds increases with the bond energy in the carbon subgroup series and defines the energy of attraction of valence electron to "its" ion.
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Distribution of Valence Electron Density in CnHm and BnHm Framework and Polyhedral Molecules and Orbital-Reduntant Bonds
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In the molecule of adamantane C10H16, the valence electron density in central areas of the cavity and faces of the C10 framework is small as compared to the electron density along its edges C-C.
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The self-consistent valence electron densities of NaNO2, AgNO2, and their constituent sublattices are calculated on the basis of the theory of the local-density functional.
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We show that the method achieves a calculation accuracy of about 1%, which earlier was possible only for atoms with a single valence electron.
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| | On the basis of"The Empirical Electron Theory of Solids and Molecules" recently published by the writer,analyses of the valence electron structures of the α,β, and γ-Al_(12)Mg_(17) phases in the equilibrium diagram of Al-Mg binary system are made. The result seems satisfactory. The agreement between the theoretical and experimental bond lengths are,in general, with △D/D% smaller than 0.06%, only few are within 0.10—0.11%. The following conclusions are drawn:(1) A molecular formula for an i... | | 本文根据作者最近发表的“固体与分子经验电子理论”中的基本理论部分,对Al-Mg二元系金相图的α,δ和γ相三个相区的结构进行了价电子结构的分析,主要是键结构的分析,得到了满意的结果,实验和理论键距误差一般在O.06%以下,只有少数几个在0.10—O.11%。 结果具有以下特点: (1)对于象γ-Al_(12)Mg_(17)这样复杂的金属间化合物分子式的化学价结构提供了满意的解释; (2)对二级近似的⊿a/a口提供了对Vegard定律的偏离,看出了固溶体由于两种大小略有不同的原子的零乱替换所产生的孔隙而引起的品格常数a,c的膨胀; (3)定性地说明了γ-Al_(12+y)Mg_(17-y)结构的低熔点和平缓下降的固相线形状; (4)全面验证了基本理论的三个假定和一个分析方法; (5)为Al,Mg的其它化合物价电子结构分析提供了基础资料。 | | 文摘来源 | | The eguilibrium constant K11 in WSM's ( Whitewey, Smith and Masson) model is a characteristic number of polymerization degree of binary silicate melts. In this paper, the relationship between some parameters and K11 are discussed. Also, the corresponding relations between K11 and following values such as the ratio of Z/γk which means the ratio of effective nucleus charges to radius of metallic ions,the second ionization energy I2,the Slater's potential energy function of second valence electron ... | | WSM(whitewey,Smith和Masson)模型的平衡常数K_(11)是二元硅酸盐熔体聚合度的表征。本文讨论了某些键参数Z/r_k(金属离子的有效核电荷与离子半径比)、I_2(第二电离能)、[(Z″-σ)/n]~2(形成二价离子的Slater电子位能函数)、x_A(Allred-Rochow电负性)与K_(11)的对应关系。其中用lgK_(11)对X~3A作图得到直线关系,其经验方程可整理为:lgK_(11)=-3.75+0.845X~3A-(Z/r_k)△X~(1/3)×lg(1600/T℃)。根据该方程可以计算二元硅酸盐熔体聚合的K_(11)值。计算结果与实验结果基本相符。 | | 文摘来源 | | The molecular orbitals of (NO2)(-1) grouping were calculated by using the all-valence electron semiempirical CNDO/S method. A general computer program for grouping theory of non-linear optical (ffects was then used to calculate the SHG coefficients of NaNO2. The agreement between the calculated values and the experimental ones was. found to be quite satisfactory without introducing any adjustable parameters. The results show clearly that the anisotropy of SHG coefficients of NaNO2 crystals is pr... | | 本文使用CNDO/S型近似方法,计算(NO_2)~(-1)的单电子分子轨道,然后按基团理论的通用计算程序计算NaNO_2晶体的倍频系数,计算值和实验值符合得较好,计算结果明确指出:NaNO_2晶体倍频系数各向异性的原因来自基团的共轭π轨道,另外,本文的计算表明,有可能对非线性光学新材料探索提供计算机的预测。 本文还就非线性光学效应的双能级模型作了讨论,并指出了它的局限性。 | | 文摘来源 | |   | | << 更多相关文摘 |
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