ICP－AES法同时测定电解金属锰中的硅、铁、硒和磷

本文研究了用ＩＣＰ－ＡＥＳ直接测定电解金属锰中的Ｓｅ、Ｐ、Ｓｉ、Ｆｅ等元素的方法，方法简便、快速，精密度和准确度均能满足对出口电解金属锰的检验要求。     

Synthesis and properties of 7,7-dichloro-3,4-benzobicyclo[4.1.0]heptane, its tricarbonylchromium complexes, and isomeric 7-chloro-3,4-benzobicyclo[4.1.0]heptanes

The reaction of Cr(CO)₆ with 7,7-dichloro-3,4-benzobicyclo[4.1.0]heptane gave the correspondingexo- andendo-chromium tricarbonyl complexes in a ratio of 4.5:1. The structures of the resulting compounds were established by NMR spectroscopy, mass spectrometry, and X-ray structural analysis. Reduction of dichlorobenzobicycloheptane and its chromium tricarbonyl complexes with LiAlH₄ affordedexo- andendo-7-chloro-3,4-benzobicyclo[4.1.0]heptanes in a 3.5:1 ratio. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 720–724, April, 1998.     

窄带光纤光栅的写入

改进相位掩模法写入光栅的装置,提高其机械稳定性和温度稳定性,不仅提高了光纤光栅的反射率,而且降低了带宽,特别是能在国产的光敏光纤上写出了大于99%反射率和小于02nm带宽的高质量的光纤光栅.这种光栅特别适用于光纤光栅传感方面的应用。     

A Neutron Diffraction Study for the Crystal Structure of the Deuterium（hydrogen） L－Arginine Phosphate Monohydrate

ＡＮｅｕｔｒｏｎＤｉｆｆｒａｃｔｉｏｎＳｔｕｄｙｆｏｒｔｈｅＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆｔｈｅＤｅｕｔｅｒｉｕｍ（ｈｙｄｒｏｇｅｎ）Ｌ－ＡｒｇｉｎｉｎｅＰｈｏｓｐｈａｔｅＭｏｎｏｈｙｄｒａｔｅＣｈｅｎｇＺｈｉ－Ｘｕ；ＣｈｅｎｇＹｕＦｅｎ；Ｇｕ...     

Excitation of stable transverse wavepackets with quadratic and cubic susceptibilities

We have identified a family of (2+1)D spatial solitary waves which can stably propagate in bulk media in the presence of coexisting diffraction, self-focusing Kerr and quadratic nonlinearities. In a conspicuous range of excitation conditions close to the stationary solutions, the emerging wavepackets are immune to the detrimental occurrence of filamentation and collapse, typical of pure Kerr media. The presence of a second-order contribution to the cubic nonlinear response is, therefore, able to prevent optical damage in applications relying on self-guidance. We show that the cross-phase modulation plays an important effect on stability. Our estimate shows that the effects of the cubic susceptibility cannot be neglected below a certain beam size in realistic crystals (e.g. KTP or similar).     

Limitation of Auger electron spectroscopy in the determination of the metal-on-oxide growth mode: Pd on MgO(100)

A discussion on the use of Auger electron spectroscopy as a quantitative tool to determine the growth mode of metals on single crystal oxide surfaces is presented. In the case of Pd grown epitaxially on MgO(100), the three-dimensional character of the growth is easily seen at coverage above one monolayer. However, in the submonolayer regime, and mainly at low substrate temperatures, the AES results are ambiguous. The combination of AES with the more sensitive helium-atom diffraction method allows us to demonstrate that the growth is three-dimensional from the early stages, the particles becoming flatter when the substrate temperature decreases. We compare our results with other growth studies on different metal/oxide systems. At low temperature, the ideal growth modes are not always observed, the final morphology of the films being determined mainly by kinetic effects. Thus a pseudo-Stranski-Krastanov growth mode is often obtained with formation of 2D islands followed by 3D clustering from a critical submonolayer coverage.     

一种多波长窄线宽环形掺铒光纤激光器

本文提出了一种利用多个光纤光栅串接来实现环形掺铒光纤多波长,窄线宽激光器的新颖方法,并在实验中验证了这一设计的合理性,得到了稳定的双波长输出。     

A peculiarity of diffraction measurements using a Gaussian laser beam

Numerical modelling of the Gaussian beam diffraction by a wire near the Fraunhofer limit is presented. Two cases are considered: the case of the wire being on the axis of the beam and the case of the wire being off-axis. For the case where the wire is on the axis, the displacements of the diffracted minima are calculated. For the off-axis case, the changes in the positions of the maxima and minima and the power density are calculated. The conditions are determined at which the measurements made using a Gaussian beam can be calculated using the formula for plane waves. This work arises in connection with research being performed into the Doppler spectrum of big particles.     

Ⅱ－Ⅵ族应变层超晶格的X射线衍射分析

本文报导了用计算机控制的衍射仪（ＣｕＫα辐射）测量的金属有机化学汽相沉淀（ＭＯＣＶＤ）方法生长的Ⅱ－Ⅵ族应变层超晶格的Ｘ射线衍射曲线，观察到了超晶格结构的多级卫星峰，且卫星峰的强度随角度呈周期性变化．对这种卫星峰形成包络的衍射曲线，用Ｘ射线运动学衍射理论进行了分析和讨论，这种讨论有助于理解Ｘ射线衍射曲线中卫星峰的形成．同时用光致发光和包络峰宽度的方法估算了样品的结构参数．     

衍射光学元件的解析分析方法

从波动光学传播的菲涅尔衍射出发，探讨一次光学转换形成任意要求的图形的问题。导得两平行传播平面的函数关系，从而在确定像面分布的条件下可以逆求出原始面的振幅与倍相分布。文中给出了几个实例，充分表明这是有实用价值的一种衍射光学元件设计方法。