Wavelength-Flattened 1×3 Single-Mode Fibre-Optical Splitters

Ｗａｖｅｌｅｎｇｔｈ－Ｆｌａｔｔｅｎｅｄ１×３Ｓｉｎｇｌｅ－ＭｏｄｅＦｉｂｒｅ－ＯｐｔｉｃａｌＳｐｌｉｔｔｅｒｓ￥ＨＵＡＮＧＹｏｎｇ；ＺＥＮＧＱｉｎｇｊｉ（ＰｈｏｔｏｎｉｃＴｅｃｈｎｏｌｏｇｙＬａｂｏｒａｔｏｒｙ，ＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃａｌ...     

Multiple photon laser photochemistry

Ｍｕｌｔｉｐｌｅｐｈｏｔｏｎｌａｓｅｒｐｈｏｔｏｃｈｅｍｉｓｔｒｙ￥Ｖ．Ｓ．Ｌｅｔｏｋｈｏｖ（ＩｎｓｔｉｔｕｔｅｏｆＳｐｅｃｔｒｏｓｃｏｐｙ，ＵＳＳＲＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｔｒｏｉｔｚｋ，ＭｏｓｃｏｗＲｅｇｉｏｎ，１４２０９２，Ｒｕｓｓ...     

Interaction of two two-level atoms with SU (1, 1 ) coherent states

Ｉｎｔｅｒａｃｔｉｏｎ ｏｆ ｔｗｏ ｔｗｏ－ｌｅｖｅｌ ａｔｏｍｓ ｗｉｔｈ ＳＵ（１，１）ｃｏｈｅｒｅｎｔ ｓｔａｔｅｓ￥ＳＯＮＧＴｏｎｇｑｉａｎｇ；ＦＥＮＧＪｉａｎ；ＷＡＮＧＷｅｎｚｈｅｎｇ；ＸＵＪｉｎｇｚｈｉ（ｌ）ＩｎｓｔｉｔｕｆｅｏｆＯｐｔ...     

CHINESE JOURNAL OF CHEMICAL PHYSICS Vol.1 5 No .1 - 6 (SumNo .85- 90 )

ＣＯＮＴＥＮＴＳＥｎｅｒｇｙＤｉｓｐｏｓａｌｉｎＰｈｏｔｏｄｉｓｓｏｃｉａｔｉｏｎｏｆＮｉｔｒｏｓｏｂｅｎｚｅｎｅＳｕｎＪｕｌｏｎｇ ,ＬｉＹａｍｉｎ ,ＹｉｎＨｏｎｇｍｉｎｇ ,ＣｈｅｎＭａｏｄｕ ,ＨａｎＫｅｌｉ,ＨｅＧｕｏｚｈｏｎｇ ,ＬｏｕＮａｎｑｕａｎ (1)………………………………………………………………………………………………………………………ＬａｓｅｒＩｎｄｕｃｅｄＦｌｕｏｒｅｓｃｅｎｃｅＥｘｃｉｔａｔｉｏｎＳｐｅｃｔｒａｏｆＣＣｌ2 ｉｎａＳｕｐｅｒｓｏｎｉｃＪｅｔ ｃｏｏｌｅｄＧａｏＹｉｄｅ ,…     

Femtosecond Spectroscopy on Simple Molecular Systems: Pump-Probe and Cars Techniques

ＦｅｍｔｏｓｅｃｏｎｄＳｐｅｃｔｒｏｓｃｏｐｙｏｎＳｉｍｐｌｅＭｏｌｅｃｕｌａｒＳｙｓｔｅｍｓ：Ｐｕｍｐ┐ＰｒｏｂｅａｎｄＣａｒｓＴｅｃｈｎｉｑｕｅｓＷ．Ｋｉｅｆｅｒ，Ｇ．Ｋｎｏｐｐ，Ａ．Ｍａｔｅｒｎｙ，Ｒ．Ｐａｕｓｃｈ，Ｍ．Ｓｃｈｍｉｔｔ，ａｎｄＨ...     

The Light Tracks in the Optical Fibers with Two Types of Parabolic Refractive Indices

ＴｈｅＬｉｇｈｔＴｒａｃｋｓｉｎｔｈｅＯｐｔｉｃａｌＦｉｂｅｒｓｗｉｔｈＴｗｏＴｙｐｅｓｏｆＰａｒａｂｏｌｉｃＲｅｆｒａｃｔｉｖｅＩｎｄｉｃｅｓ￥ＳＨＥＮＷｅｎｄａ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙ，Ｓｈａ...     

500W Rotating Switch Excimer Laser

５００ＷＲｏｔａｔｉｎｇＳｗｉｔｃｈＥｘｃｉｍｅｒＬａｓｅｒＴｈｅｈｉｇｈｐｏｗｅｒｅｘｃｅｌｅｒｌａｓｅｒ，ｕｓｉｆｉｇｔｈｅＴｕｎａｂｌｅＲｏｔａｔｉｎｇＳｗｉｔｃｈＴｅＣｈｎｏｌｏｇｙｗａｓｓｕｅ－ｃｅｓｓｆｕｌｉｎｔｈｅＰｈｏｔｏｅｌｅｃｔｒ...     

PS~(-1) Optical Interconnection of 2N×2N Using N×N Holographic Lens Array

ＰＳ（ＰｅｒｆｅｃｔＳｈｕｆｆｌｅ）ｏｐｔｉｃａｌｉｎｔｅｒｃｏｎｎｅｃｔｉｏｎｃａｎｃｏｍｐｏｓｅｄｖａｒｉｏｕｓｏｐｔｉｃａｌｉｎｔｅｒｃｏｎｎｅｃｔｉｏｎｎｅｔｗｏｒｋｓ,ｆｏｒｅｘａｍｐｌｅΩｎｅｔｗｏｒｋ．Ｈｏｗｅｖｅｒ,ｉｔｓｃｏｎｖｅｒ...     

The Squeezing Operator and the Squeezed States of "Superspace

ＴｈｅＳｑｕｅｅｚｉｎｇＯｐｅｒａｔｏｒａｎｄｔｈｅＳｑｕｅｅｚｅｄＳｔａｔｅｓｏｆ＂Ｓｕｐｅｒｓｐａｃｅ＂￥ＳＵＮＣｈａｎｇｙｏｕ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＨｅｉｈｅＴｅｃｈｅｒ＇ｓＣｏｌｌｅｇｅ，Ｈｅｉｈｅ１６４３００）ＭＡＡｉｑ...     

Variation of Satellite Intensity Factors with n in the 1s~2s∈lc→1s~23dnl→1s~2pnl Dielectronic Recombination of Lithiumlike Ions

ＶａｒｉａｔｉｏｎｏｆＳａｔｅｌｌｉｔｅＩｎｔｅｎｓｉｔｙＦａｃｔｏｒｓｗｉｔｈｎｉｎｔｈｅ１ｓ~２ｓ∈ｌｃ→１ｓ~２３ｄｎｌ→１ｓ~２ｐｎｌＤｉｅｌｅｃｔｒｏｎｉｃＲｅｃｏｍｂｉｎａｔｉｏｎｏｆＬｉｔｈｉｕｍｌｉｋｅＩｏｎｓ￥ＺｈａｏＬｉｂｏ（Ｉｎｓ?..     

锰原子的二步多光子与三步三光子共振电离研究

激光共振电离技术是痕量分析中的重要手段之一.文章以速率方程理论为基础,对锰原子的激光共振电离过程进行了分析,讨论了电离过程中各级激发光功率密度及激光作用时间对电离效率的影响;提出了根据所要求的电离效率和激光作用时间计算所需要的各激发光或电离激光的功率密度的方法;得到了饱和激发或饱和电离的规律及阈值条件.研究发现,在激光作用时间为10 ns时,锰原子饱和电离的激光强度阈值基本都在108 W·cm-2的量级,只有"1 1"双色双共振低三个量级;而"1 1"和"1 1 1"饱和激发的激光强度阈值则在102～103 W·cm-2量级;并且随着激光作用时间的增加,各过程的饱和激发和饱和电离的激光强度阈值将单调减少.     

Al(111)/Al_3Li(111)的界面性质

运用基于第一性原理的平面波贋势法,计算研究了Al (111)/Al_3Li (111)的界面性质.结果表明:Al (111)/Al_3Li (111)的界面具有三种原子配位关系结构,其中界面处仍保持与基体Al一致的三明治堆垛构型的界面稳定性最好.计算表明,该结构界面最薄弱层,位于Al_3Li (111)内,其分离功最小(约1.53 J/m~2),强度最弱,而基体Al和Al_3Li内部的强度随着到界面距离的增大而逐渐增强.     

Relativistic one-step photoemission calculations for Pt(1 1 1)

A fully relativistic one-step theory of photoemission has been applied to normal emission from Pt(1 1 1) induced by circularly polarized ultraviolet radiation. The calculated spin polarization and intensity spectra are in quantitative agreement with experimental data. Individual features are identified as bulk interband transitions and one-dimensional density of state involving initial states of specified symmetries.     

Structure of the (1 1 1) hydrogen platelet in silicon

The stability of hydrogen complexes aligned in a (1 1 1) plane of silicon is studied theoretically. Pairs of hydrogen atoms saturating broken bonds between adjacent planes are found to be the most stable arrangement with the heat of formation increasing as the platelet grows. The related stress is estimated and electronic effects are discussed.     

Diffusions of small clusters on Pt(1 1 1) and Cu(1 1 1) surfaces

Diffusions of small cluster Pt₆ on Pt(1 1 1) surface and Cu₆ on Cu(1 1 1) are studied by molecular dynamics simulation, respectively. The atomic interaction is modeled by the semiempirical potential. The results show that the diffusion processes in the two systems are far different. For example, on Pt(1 1 1) surface, the hopping of single atom and the shearing of two atoms of hexamer only occur on the adatom(s) adsorbed at B-step, while on Cu(1 1 1) surface they can appear on the adatom(s) either at A-step or B-step. To the concerted translation of the parallelogram hexamer, the anisotropy in the diffusion path is observed in the two systems, the mechanisms and then the preferential paths, however, are completely different. The reasons for these diffusion characteristics and differences are discussed.     

Precise semiconductor nanotubes and nanoshells fabricated on (1 1 0) and (1 1 1) Si and GaAs

In our previous works, we showed that ultrathin epitaxial heterofilms (down to two monolayers for the case of InGaAs/GaAs) can be controllably detatched from substrates and rolled, under the action of internal stresses, into various cylindrical micro- and nanoshells (tubes, scrolls, rings, spirals, etc.). The present review outlines the cornerstone stages in the development of this fabrication technology for semiconductor and metal nanoobjects, including: (1) directional rolling of films yielding 3D micro- and nanoshells of various shapes; (2) assembling of micro- and nanoshells in more complex architectures; (3) super-critical drying of nanoshells, and (4) formation of nanoshells whose sizes can be precisely controlled in three dimensions.With this technology new possibilities that open up for the use of strained films, selectively, grown on uncommonly used (1 1 0) and (1 1 1) surfaces, are presented. The role of mechanical anisotropy in the formation of the 3D nanoshells and the electrical and mechanical properties of formed nanotubes are discussed.     

Theoretical analysis of reactivity on Pt(1 1 1) and Pt-Pd(1 1 1) alloys

The reactivity of Pt-Pd alloy surfaces towards the oxygen reduction reaction is studied as a function of the alloy overall composition and surface atomic distribution and compared to that on pure Pt surfaces. The systems include Pd and Pt monolayers on various substrates and Pt₃Pd, PtPd and PtPd₃ surfaces of ordered alloys. Reactivity is evaluated on the basis of the adsorption strength of oxygenated compounds which are intermediate species of the four-electron oxygen reduction reaction, separating the effect of the first electron-proton transfer from that of the three last electron-proton transfer steps. None of the alloys are found to provide better sites than those of pure Pt both for O₂ dissociation and for the reduction of O and OH to water; with the skin surfaces being the closest to pure Pt. The results are discussed in relation to those found in 10-atom clusters of similar compositions and to experiments.     

Schwinger terms in 1+1 dimensions

Two different approaches — Källen’s and Brandt’s methods — for calculation of the Schwinger terms in the 1+1 dimensional Abelian and non-Abelian free current algebras are discussed. These methods are applied to calculation of the single and double commutators. The validity of the Jacobi identities is examined in 1+1 and 3+1 dimensions and in this way is given natural restriction on the regularization. It is shown that the Jacobi identity cannot be broken in 1+1 dimensions even using the regularization which fails in the 3+1 dimensional case. A connection between the Schwinger term and anomaly is shown in the simplest case of the Schwinger model.     

Two-photon E1M1 and E1E2 transitions between 2p and 1s levels in hydrogen

Two-photon transitions in the hydrogen atom are analytically evaluated within the nonrelativistic limit utilizing the Coulomb Green function method. The two-photon emission probability for the transition process 2s→2γ(E1)+1s serves as a test for the other calculations and was compared with the results of previous analytical and numerical calculations. The two-photon emission probabilities for the processes 2p→ γ(E1)+γ(M1)+1s and 2p→γ(E1)+γ(E2)+1s are also evaluated and compared with previous numerical calculations. Different nonrelativistic “forms" for the decay probabilities in combination with different gauge choices are considered.     

Water adsorption on hydrogenated Si(1 1 1) surfaces

The adsorption of water on the hydrogen terminated Si(1 1 1) surface is studied by means of first-principles calculations as well as contact angle measurements. Possible initial adsorption configurations for single water molecules and the potential energy surface are calculated. Only small adsorption energies of the order of meV are predicted. Calculations for higher coverage show that the water-water interactions are stronger than the water-surface bonding. The contact angle formed between a water droplet on the surface approximated from the total-energy calculations amounts to 88°, while our measured value is 91°.