∑_1关系式的概率联系及其230空间群表

本文以单晶体结构测定的直接法为对象,从Hauptman和Karle Σ_1关系的P (h_1)出发,利用结构因子代数的方法,讨论了惯用Σ_1关系式之间的联系和区别及P (h_1)概率值。文中引入h_1等效点权ω及h_2简并度权ε_2的概念,使得用Σ_1关系式表示的P (h_2)更为严密;并且发现,在高级晶系(四方、三方、六方和立方晶系)中存在着大量相关的Σ_1关系式。按本文的结果,只需保留其为数不多的独立的Σ_1关系式。文中采用线性化原则,完成了高级晶系156个空间群Σ_1关系式的造表工作。加上Haek完成的74个后,提供一份包括230空间群的简明完备的Σ_1关系式表。另外,还对Haek表做了三处勘误。     

PROBABILITY CORRELATION OF ∑_1 RELATION-SHIPS AND THEIR TABLES OF 230 SPACE GROUPS

In the present paper, using the structure factor algebra method, we discuss the correla-tion and the distinction between thte conventionally used ∑_1 relationships and the probabilityvalue of P_ (h_1) on the basis of the P_ (h_1) of Hauptman's ana Karle's ∑_1 relationship. Theintroduction of conception on equivalent point weight ω of h_1 and degeneracy ω_2 of h_2 makesthe probability P_ (h_1) expressed by ∑_1 relationships become more strict. There are a lot ofinterrelated ∑_1 relationships in all four high symmetry crystal systems. According to theresults of this paper, what we need is noly to retain a few independent ∑_1 relationships. Usingthe principle of linearization, we have completed the tables of the ∑_1 relationships for 156space groups which belong to tetragonal, trigonal, hexagonal and cubic crystal systems.Now, we present the concise and perfect tables of 230 space groups of which 74 wereaccomplished by Hasek.     

激光对空中目标测距的大气修正研究

根据大气结构特性提出了一个只需测量站大气参数的激光大气距离修正公式 ,它对大气层内、外目标具有普遍的适应性 ,而且能适应于低仰角目标的修正 ,其距离修正计算误差 ,在仰角大于 5°时 ,优于 2 .5cm。     

《声学最新进展》即将出版

随着科学技术的发展,声学的应用日益广泛.为了推动声学研究和应用,促进声学技术交流,中国科学院声学研究所编辑了《声学最新进展》一书.书中收入了声学界著名学者和有关科技人员编写的十六篇反映声学各分支学科进展的综述和介绍美、苏、英、法、西德、日本、澳大利亚等国声学发展概况的文章.内容包     

一氯·四(对甲氧基苯基)卟啉合锰(Ⅲ)的分子和晶体结构

氯代四(对甲氧苯基)卟啉合锰(Ⅲ)的晶体属于正交晶系,空间群为P_(bca)。晶胞参数:a=23.3973(6)A,b=22.5524(7)A,c=15.1043(2)A。V=7970.02A~3,Z:8。收集衍射强度在Nicolet XRD R3系列四圆衍射仪上进行。数据收集范围3°<2θ<45°,以ω扫描,用MoK_α射线,共收集到独立衍射点5200个,可观察点2859个(Ⅰ>3σ(Ⅰ))。重原子法测定结构,用方块矩阵最小二乘法修正结构参数,Mn-N的平均键长为2.005A,Mn-Cl的键长为2.370(3)A。     

军用激光技术和装备研究

本文综合介绍了华北光电技术研究所激光军事装备技术的研究成果和发展情况。     

In Situ Hydrothermal Synthesis of a Mononuclear Copper（Ⅱ） Complex： Cu（H2SIP-O）（bpy）（H2O） （H4SIP-O = 4-Hydroxyl-5-sulfoisophthalic Acid）

The mononuclear complex, Cu（H2SIP-O）（bpy）（H2O） （H4SIP-O = 4-hydroxyl- 5-sulfoisophthalic acid and bpy = 2,2＇-dipyridyl）, has been synthesized by the hydrothermal reaction of Cu（OH）2 with NaH2SIP and bpy at 160 ℃, and characterized by single-crystal X-ray diffraction, elemental analysis and IR spectrum. The new ligand 4-hydroxyl-5-sulfoisophthalic acid derived from 5-sulfoisophthalic acid ligand under an in situ hydrothermal condition. The crystal of the complex crystallizes in a triclinic system, space group P1, with a = 7.757（4）, b = 10.663（6）, c = 11.727（7）A, α = 94.272（4）, β = 104.067（7）, γ = 97.400（7）°, V= 927.4（9）A^3, Z = 2, C18H14N2O9SCu, Mr= 497.93, Dc= 1.783 g/cm^3,μ = 1.350 mm^-1, F（000） = 506, the final R = 0.0518 and wR = 0.1513 for 4180 observed reflections with I 〉 2σ（I）. The central Cu（II） ion is five-coordinated by two oxygen atoms from the H2SIP-O^2- ligand and two nitrogen atoms of bpy ligand in a distorted square-planar geometry as well as a water oxygen atom in the apical position to complete a distorted square-pyramidal coordination geometry. The mononuclear copper molecules are linked by hydrogen bonds between coordinated water molecules and sulfonate groups to form a one-dimensional double-chain structure. The chains are further held together through extensive π-π stacking interactions between the aromatic rings to form a three- dimensional supramolecular structure.