Investigation on ultrafast thrid—order optical nonlinearity of metal（dmit）2／mnt）2 Charge transfer complexes

We have investigated the transient third-order optical nonlinearity of the solutions of Metal(dmit)2/(mnt)2 salts in acetone by employing femtosecond optical Kerr gate measurement at 830nm wavelength.An order of enhancement on the second-order hyperppolarizability is found for the above salts with central atoms of Cu and Ni.We have suggested an explanation for the enhancement based on the extension of electronic conjugation by the entring Cu or Ni atom.     

Ultrafast third-order optical nonlinearity of several sandwich-type phthalocyaninato and porphyrinato europium complexes

The third-order optical nonlinearity of two sandwich-type phthalocyaninato and porphyrinato europium com- plexes, including double- and triple-deckers （Eu[Pc（OC5H11）8]2, Eu2（Pc）（TPP）2, Pc=phthalocyanine, TPP=5, 10, 15, 20- tetraphenylporphyrinate）, was investigated by using the femtosecond time-resolved optical Kerr gate method at 830 nm wavelength. Their second-order hyperpolarizability is estimated to be 0.74× 10^-30esu and 3.0× 10^-3esu respectively. This exhibits an evident enhancement in comparison with 0.47×10^-30esu for one-decker Eu（Pc）（acac） （acac=acetylacetonate）, which is also measured under the same conditions. The enhancement is attributed to the introduction of lanthanide metal to the large π-conjugated system, intermacrocycle interaction and two-photon resonance etc.     

利用磁聚焦法测量地磁场

利用电子比荷测试仪,借助罗盘、水平仪和铅垂等简单工具,分别测量进行磁聚焦后正、反向两次通过的励磁电流,计算出地磁场的水平分量和垂直分量,从而确定出地磁场的大小和方向.     

对一道高考题的探究

2008年高考数学全国卷(Ⅱ)第21题: 设椭圆中心在坐标原点,A(2,0)、B(0,1)是它的两个顶点,直线y=kx(k>0)与AB交于点D,与椭圆交于E、F两点.     

C60腈胺类衍生物的合成及三阶非线性光学性质

C60的三阶非线性光学性质的研究是近年来富勒烯物理化学性质的研究热点之一[1].研究显示,尽管C60具有三维共轭的π电子体系,其本身并不具有大的三阶非线性系数[2,3].但由于C60分子具有较低的三重简并LUMO能级,显示出较强的电负性,能够与适当的给电子体形成相应的电荷转移体系,其三阶非线性系数可提高一至两个量级[3-6].本文通过合成C60的腈胺和双聚腈胺衍生物及其Fe(Ⅲ)配合物,对其三阶非线性光学性质及电荷转移作了初步探讨.     

C60睛胺类衍生物的合成及三阶非线性光学性质

Ｃ６０的三阶非线性光学性质的研究是近年来富勒烯物理化学性质的研究热点之一［１］．研究显示,尽管Ｃ６０具有三维共轭的π电子体系,其本身并不具有大的三阶非线性系数［２,３］．但由于Ｃ６０分子具有较低的三重简并ＬＵＭＯ能级,显示出较强的电负性,能够与适当的?..     

γ－乙二胺基丙基杂氮硅三环与氯化铜、氯化钴配合物的红外光谱研究

用γ－乙二胺基丙基杂氮硅三环分别与氯化铜、氯化钴反应制备了两种固体配合物。根据元素分析和原子吸收光谱结果确定了配合物的组成，并对配合物的红外光谱进行了归属和分析。     

对椭圆一个性质的探究与推广

湖北省八校2008年三月调研数学试卷（理科）第10题：设AB是过椭圆x^2/4＋y^2/3=1右焦点F的动弦，过点A作右准线的垂线，垂足为点C，则直线BC必过定点     

一类数列不等式证明的新思路

数列不等式如果一边是和或者积的形式,常用放缩法或者数学归纳法来证明．但是放缩法技巧性较强,学生难于把握;而数学归纳法操作上比较机械,学生熟悉方法后对优化思维无太大好处．这里介绍另外一种证明此类不等式的思路．     

Ultrafast Third-Order Nonlinear Optical Response of Organic-Inorganic Hybrid Materials （C19H25N2）7Hn [P2Mo18-n Vn O62]

We have measured the third-order optical nonlinearity of the organic-inorganic hybrid materials of supermolecules (C19H25N2)7Hn [P2Mo18-n Vn O62] (n = 1, 2, 4, 5) and their reactants (C19H25N2) Br and Hn 6[P2Mo18-n Vn O62] by using the ultrafast optical Kerr effect at 830 nm wavelength, with time resolution of 115fs. By comparing the γ values of the supermolecules and their reactants, it is concluded that the charge-transfer eahanced remarkably the third-order optical nonlinearity of the compounds. With the increment of the number of the vanadium atoms,the electron distribution changed strongly and the γ value decreased dramatically.