电荷转移金属[60]富勒烯盐的光电性质

用物理喷束淀积技术制备了过渡金属[60]富勒烯盐C60Ni薄膜，研究了Al/C60Ni/ITO光电池的光伏效应和正反向电学特性并与Al/C60/ITO膜进行了比较。用界面偶极电场解释了Al/C60Ni界面光伏效应和整流应的增强，表明在该样品中发生的从Ni原子到C60的电子转移使Al/C60Ni界面偶极电场增强。     

pp和PbPb碰撞中大横动量K和π的光生过程(英文)

基于微扰量子色动力学(pQCD),计算了考虑核遮蔽效应和喷注淬火效应的pp和PbPb碰撞中大横动量K和π的光生过程的产额。在光生过程中可以看到K~+/π~+的增强。数值计算结果表明,所考虑的光生过程对K和π产生是一个很好的修正。     

新型隔层材料LB交替多层膜的二次谐波研究

有机光学非线性材料在光计算和光通讯领域中有着非常广泛的应用前景［1，2］．非中心对称结构是二阶非线性光学器件的基本要求之一，对于有机两亲光学活性分子而言，使用能够在分子尺度上实现有序组装的Langmuir－Blodgett（LB）技术，可以制备具有稳定而非中心对称结构的多层膜．一般说来，Y型结构的多层膜比X型或Z型更稳定．然而，由单一材料组成的Y型LB多层膜只能形成中心对称结构，因而对宏观二阶非线性极化率X（2）没有贡献．为了解决稳定性与非中心对称性的矛盾，我们可以将光学非线性活性材料（如半花菁染料）与非活性隔层材料…     

Acid Treatment Enables Suppression of Electron–Hole Recombination in Hematite for Photoelectrochemical Water Splitting

We report a strategy for efficient suppression of electron–hole recombination in hematite photoanodes. Acid‐treated hematite showed a substantially enhanced photocurrent density compared to untreated samples. Electrochemical impedance spectroscopy studies revealed that the enhanced photocurrent is partly due to improved efficiency of charge separation. Transient absorption spectroscopic studies coupled to electrochemical measurements indicate that, in addition to improved bulk electrochemical properties, acid‐treated hematite has significantly decreased surface electron–hole recombination losses owing to a greater yield of the trapped photoelectrons being extracted to the external circuit.     

在RHIC和LHC中光子-核子碰撞产生的大横动量双轻子

研究了RHIC和LHC能区的Au-Au和Pb-Pb周边重离子碰撞中,来自光子-核子相互作用产生的大横动量双轻子。利用微扰QCD 参数化和Weizs?cker-Williams近似计算了双轻子的产率。经过与领头阶和碎裂过程的双轻子产生数值计算结果相比较,光-核碰撞过程产生的大横动量双轻子在RHIC能区是可忽略的。但是在LHC能区,光-核碰撞在大横动量区域是周边重离子碰撞的一个重要的双轻子源。     

Mechanistic Insight into the Photoinduced Damage of an Unnatural Base Pair

Chemical- and photostability of unnatural base pairs (UBPs) are important to maintain the genetic code integrity, and critical for developing healthy semisynthetic organisms. As reported, dTPT3 was less stable upon irradiation, and thus might act as a pervasive photosensitizer to induce oxidative damage within DNA, causing harm to living semi-synthetic organisms when exposed to UVA radiation. However, there was no knowledge about molecular-level understanding of this damage process. In this paper, we not only identified four photoproducts of dTPT3, including desulfur-dTPT3 (dTPT3^H), TPT3 sulphinate (TPT3^SO2), TPT3 sulphonate (TPT3^SO3) and TPT3-thioTPT3 (TPT3^STPT3), but also established a Type II photosensitized oxidation mechanism. In addition, the antioxidant (sodium ascorbate) was able to effectively inhibit the photoproducts formation of dTPT3 and dTPT3 in DNA, suggesting that a reductive environment might protect DNA bearing dTPT3 against UVA oxidation and ameliorate its adverse biological effects. The comprehensive understanding of TPT3’ photochemical stability will give researchers helpful guidance to design more photostable UBPs and construct healthier semisynthetic organisms.     

Standing Waves of the Coupled Nonlinear Schrdinger Equations

In this paper, we study the existence of standing waves of the coupled nonlinear Schr dinger equationsThe proofs of which rely on the Lyapunov-Schmidt methods and contraction mapping principle are due to FWeinstein in [1].     

耦合Schrdinger和KdV方程组孤波解的存在性

主要研究了耦合的非线性Schrdinger和KdV方程孤波解的存在性.文章利用集中紧性原理找到预紧性的极小化序列,通过平移的方式来寻找方程组对应泛函在H~1(R)的极小值函数,从而得到原方程非平凡解的存在性.     

氧化铟锡薄膜的二阶非线性光学特性研究

利用二次谐波产生技术研究了氧化铟薄膜的非线性光学特性.氧化甸锡薄膜中多晶晶粒的优先取向,使其产生了非常强的二次谐波信号,并且在一定的薄膜存度以上,随薄膜厚度的增加二次谐波信号显著增强.由于多晶晶粒的优先取向使得薄膜基板平面内存在着非常明显的非线性光学各向异性.     

FAR-INFRARED SPECTRA OF LANGMUIR-BLODGETT FILMS OF CHLOROPHYLL a,CHLOROPHYLL b,PHEOPHYTIN a and THEIR ADDUCTS WITH WATER and DIOXANE*

Fourier transform infrared spectra in the low frequency region (500–150cm^?1) of Langmuir-Blodgett films of chlorophyll a (Chi a), chlorophyll b (Chi b) and pheophytin a have been studied. Correlations between spectral changes in monolayer and multilayers of Chi a and Chi b and their adducts with water and dioxane have been established. Spectroscopic evidence has indicated that, although there are no individual absorption bands that can be assigned to pure Mg-nitrogen and/or Mg-oxygen stretching or bending modes, there are several bands in the400–200 cm^?1 region of the spectra containing considerable contributions from metal-nitrogen and metal-oxygen vibrational modes. These specific vibrations exhibit marked intensity changes and shifts upon water and dioxane interaction. The different states of chlorophyll aggregation in Langmuir-Blodgett mono- and multilayers films resulted in noticeable changes in their far-IR spectra.