激光增强电沉积铜过程的研究

用旋转圆盘电极法研究了激光照射下铜的电沉积过程。证明激光照射引起电极界面微区温度升高, 使平衡电位正移, 交换电流i~o和电荷传递系数α均增大, 剧烈的微区搅拌提高了极限扩散电流。这些变化都加快了电沉积速度, 使高速局部电镀有可能实现。     

用分子束研究.F(^2P)与CH3F和CH3Cl的化学反应

近年来, 我们在研究含氟烯烃和烷烃的红外激光诱导氧化和氯化反应的基础上, 深入研究了红外激光诱导卤代烷烃的脱卤化氢并生成: CF2卡宾和:CFCF3卡宾的反应[1-4]以往的研究往往是根据反应产物推论反应机理, 认为在反应过程中存在着卡宾中间体,但在实验中未能直接检测到. Kakimoto[5,6]曾报道过在流动体系中测到了.F+CH3F和.F+CH3Cl反应中:CHF和:CHCl的激光荧光激发谱, 但没有讨论卡宾形成的机理.Hirota[7]在讨论.F+CH3F反应时, 认为:CHF可能由攫氢过程产生而对于.F+CH3Cl反应同时生成:CHF和:CHCl未做说明. 本实验中用扩散分子束代替了流动反应体系, 从而大大减少了产物和反应物气体分子间的猝灭过程, 获得了信噪比大而清晰的图谱, 由此确证了:CHF和:CHCl的存在, 说明了.F+CH3Cl反应中自由基攫氢过程和偶合反应过程共存的反应历程. 这一结论对红外激光诱导一碳卤代宾化学反应机理研究有重要参考意义.     

连续CO2激光引发的1,1-二氟乙烷与氯的反应

本文报道了CW-CO2激光引发的CF2HCH3与Cl2的反应.除主要产物CF2=CH2外,还有CF2ClCH3. CF2ClCH2Cl. CF2=CHCl. CF2=CCl2和CF2Cl2.为了探索应用激光方法合成CF2=CH2的可能性,研究了激光输出功率. 照射时间. 反应体系中CF2HCH3与Cl2的比例及样品压力对CF2=CH2得率的影响.同时为了探讨反应机理,还进行了TEA-CO2激光引发CF2HCH3加Cl2实验和CW-CO2激光作用下CF2=CH2. CF2=CH2加Cl2的反应研究,令人感兴趣的是在激光照射CF2=CH2时,发现了双键的断裂.     

硅与碳、磷、硫、氧的二元簇离子的激光产生

通过在自制仪器上发生的激光等离子体反应, 产生了硅与碳、磷、硫、氧等非金属元素形成的二元原子簇离子, 记录了它们的飞行时间质谱。根据对这些簇离子的组分的分析, 认为在硅碳簇离子中碳原子形成直链, 硅原子位于链端; 硅硫簇离子中的硅原子向一维伸展, 通过硫原子桥连一起; 硅磷簇离子则主要来取多面体的构型。所有成簇硅原子的价电子在各簇离子中都充分参于成键。     

NdP5O14晶体的晶场参数

NdP5O14晶体是一种高钕浓度的化学计量比的新型激光材料,它在高的Nd(III)浓度下荧光几乎不发生猝灭.本效计算了它的主要晶场参数,以深入了解它的光学性质.     

F原子与i-C3H7I反应的动力学研究

本文利用交叉分子束技术和激光诱导萤光方法, 研究了F+i-C3H7I→IF+i-C3H7反应的动力学过程. 获得了产物IF相对初生振动分布和相对细致反应速率常数. 初生态布居接近于模型III下的统计理论斯待值, 这不仅表明反应经过长寿命“配合物", 而且也说明自由基i-C3H7的内态是激发的. 另外, 确定了反应的产物IF内部能量分配和总反应截面σ, σ=(3.6±0.5)×10^-^1^6cm^2.     

小角激光散射法研究聚苯基喹 啉在稀溶液中的缔合现象

聚[2,2'-(1,4-苯撑)-6,6'-双(3-苯基喹 啉)](PPQ)是一种耐高温材料, 其合成方法, 机械性能及应用方面的研究已有很多报导, 但是有关其溶液性质和分子形态的研究还甚少。本文用小角激光散射法研究了PPQ的稀溶液性质, 并报导了PPQ在溶液中的缔合现象。     

Laser flash photolysis detection of mono- and biradical mesitylene

Time-resolved transient absorption spectra have been obtained first for mesitylene by 355 nm laser flash photolysis at ambient temperature. Mono- and biradicals were observed in the experiment, in which the transient absorption peak at about 370 nm was assigned to the biradical and the peak at about 580 nm to the monoradical; the biradical has a longer lifetime than the monoradical. According to the representative value of the C-H bond dissociation energy for aromatic compounds monoradical formation might be a single-photon process. For comparison with the absorption spectra the time-resolved fluorescence spectra were obtained and also the biradical was assigned to about 393 nm.     

几种碳卤化物多通道激光化学的研究

本文用CW和TEA CO2激光器研究了F12(CF2Cl2)、F114(CF2ClCF2Cl)和F22(CF2HCl)等碳卤化合物的激光诱导解离反应, 实验发现, 在激光作用下, 这些化合物的解离方式不仅与化合物的性质有关, 还与激光的能量密度密切相关; F22的激光解离为一级反应,并存在“瓶颈效应".     

Colours from electroactive polymers: Electrochromic, electroluminescent and laser devices based on organic materials

This paper focuses on the most relevant devices currently used in order to achieve electrically stimulated generations of colours from electroactive polymers, either as coloured light emissions from the material or as modifications of its intrinsic colour properties. For this purpose, most relevant materials, fundamental principles of operations, latest developments and current applications of organic-based electrochromic, electroluminescent and lasing devices are reviewed here. The very promising performances resulting from the analysis of state-of-the-art products, and in particular of those which are currently approaching commercial applications, suggest likely roles played by such devices for niche applications in the very near future.