The effect of an anti-hydrogen bond on Fermi resonance： A Raman spectroscopic study of the Fermi doublet v1-v12 of liquid pyridine

The effects of an anti-hydrogen bond on the v1 v12 Fermi resonance （FR） of pyridine are experimentally investigated by using Raman scattering spectroscopy. Three systems, pyridine/water, pyridine/formamide, and pyridine/carbon tetrachloride, provide varying degrees of strength for the diluent-pyridine anti-hydrogen bond complex. Water forms a stronger anti-hydrogen bond with pyridine than with formamide, and in the case of adding non-polar solvent carbon tetrachloride, which is neither a hydrogen bond donor nor an acceptor and incapable of forming a hydrogen bond with pyridine, the intermolecular distance of pyridine will increase and the interaction of pyridine molecules will reduce. The dilution studies are performed on the three systems. Comparing with the values of the Fermi coupling coefficient W of the ring breathing mode v1 and triangle mode v12 of pyridine at different volume concentrations, which are calculated according to the Bertran equations, in three systems, we find that the solution with the strongest anti-hydrogen bond, water, shows the fastest change in the v1-v12 Fermi coupling coefficient W with the volume concentration varying, followed by the formamide and carbon tetrachloride solutions. These results suggest that the stronger anti-hydrogen bond-forming effect will cause a greater reduction in the strength of the v1-v12 FR of pyridine. According to the mechanism of the formation of an anti-hydrogen bond in the complexes and the FR theory, a qualitative explanation for the anti-hydrogen bond effect in reducing the strength of the v1 - v12 FR of pyridine is given.     

THE EXACT SOLUTIONS OF THE BURGERS EQUATION AND HIGHER-ORDER BURGERS EQUATION IN (2+1) DIMENSIONS

Some exact solutions of the Burgers equation and higher-order Burgers equation in (2+1) dimensions are obtained by using the extended homogeneous balance method. In these solutions there are solitary wave solutions, close formal solutions for the initial value problems of the Burgers equation and higher-order Burgers equation, and also infinitely many rational function solutions. All of the solutions contain some arbitrary functions that may be related to the symmetry properties of the Burgers equation and the higher-order Burgers equation in (2+1) dimensions.     

低浓度样品拉曼光谱的实验研究

在液芯光纤内产生共振拉曼效应,可以提高拉曼光谱强度１０＾９倍。测定了１０＾－１０－１０＾－５ｍｏｌ／Ｌ浓度样品的拉曼光谱。实验结果表明,β－胡罗卜素在ＣＳ２中１５２０ｃｍ＾－１拉曼线的强度（散射系数）、频移、线宽随浓度降低而发生变化。     

铂胶体粒子的形貌控制研究

在含有草酸根稳定剂的水溶液中,以氢气还原K_2[Pt(C_2O_4)_2], K_2PtCl_6以及K_2PtCl_4制备形状不同的Pt胶体粒子,其平均尺寸分别为6.5, 3. 5和7.9nm。UV-vis和电镜研究结果表明,还原速度,Pt纳米粒子的尺寸和形状分布 均与所用前体有关。以K_2[Pt(C_2O_4)_2]为前体制备的Pt胶体粒子具有很窄的尺 寸和形状分布,立方形粒子所占比例为93%。以K_2PtCl_4或K_2PtCl_6为前体制备 的Pt胶体粒子的形状分布较宽。草酸根稳定的Pt胶体在空气中放置时,Pt胶体粒子 催化草酸根氧化分解,使得胶体溶液中草酸根浓度降低,Pt胶体粒子形成线状聚集 体,氢气处理后,线状聚集体转化为Pt金属纳米线。     

三苯胺甲醛二苯腙的合成及其光电性能研究

合成了一种新型的三苯胺类载流子传输材料三苯胺甲苯二苯腙,通过一系列手段对该化合物性能进行了表征,并以此化合物为载流子空穴传输材料,Y-型酞菁氧钛为载流子产生材料制备了光导器件,测定了该光电器件的光电性能,显示出良好的光电性能(E_1/2=1.0lx.s),可以替代常用的载流子传输材料二乙基苯甲醛二苯腙.     

Au/(SiO2/Si/SiO2)纳米双势垒/n+-Si结构的电致发光研究

利用射频磁控溅射方法,在n⁺-Si衬底上淀积SiO₂/Si/SiO_{2纳米双势垒单势阱结构,其中Si层厚度为2至4nm,间隔为0.2nm,邻近n⁺-S i衬底的SiO2层厚度固定为1.5nm,另一SiO2层厚度固定为3nm.为了 对比研究,还制备了Si层厚度为零的结构,即SiO2(4.5nm)/n⁺-Si 结构.在经过600℃氮气下退火30min,正面蒸上半透明Au膜,背面也蒸Au作欧姆接触后,所 有样品都在反向偏置(n^＋-Si的电压高于Au电极的电压)下发光,而在正向偏压 下不发光.在一定的反向偏置下,电流和电致发光强度都随Si层厚度的增加而同步振荡,位 相相同.所有样品的电致发光谱都可分解为相对高度不等的中心位于2.26eV(550nm)和1.85eV (670nm)两个高斯型发光峰.分析指出该结构电致发光的机制是：反向偏压下的强电场使Au/( SiO2/Si/SiO2)纳米双势垒/n⁺-Si结构发生了雪崩击穿 ,产生大量的电子-空穴对,它们在纳米SiO2层中的发光中心(缺陷或杂质)上复 合而发光. 关键词： 电致发光 纳米双势垒 高斯型发光峰 雪崩击穿}     

表面高分辨弹性反冲探测分析

在中国原子能科学研究院 HI- 1 3串列加速器上建立了用 Q3D磁谱仪动量分析和ΔE- E粒子分辨对材料表面进行高分辨的弹性反冲探测分析技术 .用 1 0 0 Me V12 7I对 C/Li F多层样品的深度分布分析表明 ,表面分辨达到 1 .2 nm.所建立的ΔE(气体 ) - E(半导体 )望远镜探测器可同时分析从轻至中重的所有元素 .实测了新光电材料 Ga N,La2 Sr Cu O4 超导膜和新超硬材料 C3N4 (Si)等样品. High resolution depth profiling technique with elastic recoil detection analysis has been developed at the HI 13 tandem accelerator of CIAE. A depth resolution of 1.2 nm was achieved at the surface of the samples with the Q3D magnetic spectrometer and the focal plane detector. From light to medium heavy elements were simultaneous analyzed with a small Δ E E telescope. The method was applied to depth profile analysis of C/LiF multilayers, La 2SrCuO 4 superconductor and GaN foil samples.     

有限球中14MeV中子点源问题的数值模拟

点源问题的物理实验与数值计算是研究反应堆防护和辐射效应,考查中子参数和计算方法的重要手段。本工作解决了有限元节点上的加源问题,并对几个典型的14MeV中子点源问题的物理实验,用双向间断有限元法进行了数值模拟,并和其它方法的计算结果及物理实验的测量结果进行了比较,取得了较为满意的结果。     

光纤共振拉曼光谱法痕量分析研究

在液芯光纤内产生共振拉曼效应,可以提高拉曼光谱强度１０＾９倍。样品（被测物）的浓度、模吸收系数、光散射系数和模耦合系数决定光纤最佳长度。该技术分子光谱研究提供了一种新实验方法,在痕量分析、液体中少量分子相互作用研究等方面有很大的应用潜力。低浓度的β－胡萝卜素（β－ｃａｒｏｔｅｎｅ）在ＣＳ２中和Ｉ２在ＣＳ２中的拉曼光谱被得到,其浓度分别是１×１０＾－１３ｍｏｌ／Ｌ和１×１０＾－１４ｍｏｌ／Ｌ。     

吡啶非谐振耦合(费米共振)的二维相关拉曼光谱研究

费米共振(FR)是一种广泛存在于分子内和分子间的分子振动耦合和能量转移现象。研究了吡啶与乙醇混合溶液中的吡啶分子内费米共振效应(ν1～ν₁₂,ν₁+ν₆～ν₈),发现了吡啶乙醇存在分子间氢键(O—H…N),通过费米共振参数变化和二维相关拉曼光谱(2DCRS)揭示了吡啶乙醇溶液相互作用机理。ν₁～ν₁₂,ν₁+ν₆～ν₈通过非谐相互作用引起能量转移,从而导致费米共振参数的变化。2DCRS可以提供更多费米共振信息,阐明了费米双峰的相互作用机制。