铜在ρ-Si上激光诱导电沉积过程的研究

由于在微电子器件制造，成像系统及太阳能电池等领域里具有广阔的应用前景，激光诱导化学及电化学沉积金属的研究，最近几年引起了极大兴趣［1－3］，例如Zahavi［4］报道了Pd，Au，Ni－Pd在氩离子激光作用下可以不加偏压实现在半导体Si，InPGaAs上的无掩膜选择性沉积，金属沉积只发生在光照部位．大多数研究工作是围绕应用技术而开展的，理论研究，尤其是光电化学方面的研究尚十分欠缺．我们认为对于普通电镀液中的激光诱导电沉积来讲，既使不需外加偏压，沉积过程也必然伴随着溶液中金属离子与半导体能带之间的电荷传递，因此可以通…     

结晶聚合物的中间层

介绍了结晶聚合物中间层概念及各种实验技术所提供的中间层存在的证据。附25篇参考文献。     

LIGHT-SCATTERING STUDY OF POLYELECTROLYTE HOLLOW CAPSULES

Silver halide (AgX) microcrystal was used as template to synthesize hollow polyelectrolyte capsules. These hollow capsules were characterized by laser light scattering (LLS) used to measure the size of the capsules in solution. The ratio of hydrodynamic radius (Rh) from dynamic LLS to the radius of gyration (Rg) from static LLS is almost unity, revealing that the entities are hollow in solution. The results suggest that the LLS method can be regarded as a good complement to the confocal laser scanning microscopy (CLSM) method for the characterization of small hollow capsules, and it possesses the advantage of not needing fluorescence labeling.     

C_πB~-的激光等离子体产生与质谱分析

随着“足球烃”C_(60)及其他“球碳烃”的发现,以及对它们奇妙的结构与化学行为的不断揭示,碳原子簇的产生与研究已成为当前化学界的一个热门课题.Smalley等最近又将C_(60)中的一个碳原子以硼原子取代,成为Lewis酸,使这方面的研究更加深入。近二年来,我们在自制的装置上对碳原子簇的结构作了较为充分的研究后,又以独特的方式产生了链状构型的C_nB~-,记录了它们的负离子质谱。     

Laser technology application: Deformation and elastic recovery of semi-crystalline polymers

The elastic deformation-recovery and mechanical properties of semi-crystalline polymers (HDPE, LDPE and their blends) were investigated. An optoelectronic technique based on a laser beam was used to analyze the behavior of the samples under radial stress. The laser technology showed that the recovery process develops in two stages. The first one is governed by the elastic component and the second and slower one is controlled by the inelastic component of the material. At low deformation, the overall recovery is attributed to the development of structural micro-domains generated when shearing the amorphous segments of the polymer. The radial Young modulus was also determined and compared to unidirectional measurements. At low deformation both techniques provide very similar values; nevertheless, the radial Young modulus departs significantly from the unidirectional one when increasing the number of cycles of deformation-recovery.     

Size of Micelles Determined by Static Fluorescence Quenching

We developed a new method to measure the average aggregation number of large rod-like micelles using static fluorescence self-quenching of a solubilized fluorophore. The method is based on the increase of self-quenching of micelle-solubilized pyrene through excimer formation. We consider the effect of random distribution of pyrene in micelles and the micellar size distribution. The measured average aggregation <n> _M is based on a new M-weighted raging similar to our exponential-weighted averaging in the transient decay method. We apply this method to study the effect of a large concentration of salt on the average aggregation behavior of sodium dodecyl sulfate (SDS) and cetyle tetraammonium bromide (CTAB). The sizes increase with increasing ionic concentrations. For SDS, we used the thermodynamic model developed by Missel et al. to calculate < n > _M which we compare with experimental results.     

激光核聚变中的一种X光解谱方法

本文在SAND迭代法的基础上,采取带有周期性光滑化的限幅迭代方法,求解激光核聚变中的X光能谱取得了较好的结果。这个方法适用于根据亚千X射线谱仪、多道k边滤波谱仪和多道滤波-荧光谱仪的测量结果回推靶等离子体的X射线能谱。计算结果表明,该方法完全抑制了数值不稳定性,消除了非物理的“负能谱”现象和解谱结果中的数值结构。特别是该方法对初始试探谱有很强的适应性,解谱计算结果与初始试探谱无关。     

聚合物系统中的传能和光化学

评论了聚合物系统中非辐射能量传递类型,影响能量传递的因素,以及能量传递同聚合物光化学的关系,附22篇文献。     

The high resolution infrared spectrum and laser Stark spectroscopy of thev8 band of propyne

The perpendicularv ₈ band lying in the 1000–1100 cm^–1 region has been studied from infrared and laser Stark, spectra. We were interested in the part of spectrum corresponding to the spectral range of the 9 m CO₂ laser lines. Assignments of rovibrational lines with J'<40 and K'<6 have been made. About 100 Stark resonances have been assigned to 12 rovibrational transitions. Effective molecular constants and dipole moment have been determined with high accuracy. A list of close resonances with CO₂ laser lines is given and may be used for optical pumping experiments.