(e,2e)电子动量谱仪研制和若干原子分子的电子动量谱测量

研制成功了一台先进的多功能用途的（e，2e）电子动量谱仪．装置采用电子束和气体束交叉碰撞方式；使用微通道板一维位置灵敏电子探测器；成功地实现了多参数数据获取和离线分析技术．利用该谱仪分别测量了氦、氩原子和氢、甲烷分子的电离能谱和电子动量谱．该谱仪的能量分辨率为ΔE=1.8eV，动量分辨率为Δp～0.15au  

单原子分子测控的进展

单原子分子测控是近年来发展起来的实验技术，其操作对象是单个的原子或分子。完整的单原子分子测控包含了对单原子分子的成像、识别、操纵和组合分解四个方面。本分别对这四个方面进行了系统综述，介绍了国内外相关技术的发展和现状，并对其未来做了展望。  

中能电子的全截面测量装置和对氮分子的散射全截面

介绍一台用于中能电子散射全截面的测量装置，并给出了５００－２６００ｅｖ电子与氮分子散射全截面的实验结果。  

250—1400eV能区N2分子的电子散射全截面测量

建立了一套直线透射式全截面测量装置,并测量了250—1400eV能区N₂分子的电子散射全截面,实验误差为3.5%。测量的结果与已报道实验和理论工作做了比较。  

两维位置灵敏探测器的能量和动量响应函数刻度

用弹性散射对多通道(e,2e)谱仪两维位置灵敏探测器的能量和动量响应函数进行了刻度,从位置灵敏探测器输出的两维位置信息中获得了弹性散射的能谱和角度谱,估计了在当前实验条件下的能量分辨和角度分辨.同时,我们用正交多项式的最小二乘法拟合得到了谱仪单路的能量和动量响应函数.  

Theoretical calculation of triple differential cross sections of 3s orbital of argon in coplanar symmetric （e, 2e） reaction

The triple differential cross section for the low-energy electron impact ionization of inner-valence 3s orbital of argon has been calculated using the modified distorted wave Born approximation in coplanar symmetric energy-sharing geometry. Satisfactory agreement between theory and experiraent is achieved when the polarization and post-collisional interaction (PCI) are included in the calculations. It is shown that the polarization and PCI effects play a very important role in the case of argon at low incident energies.  

Conservation Laws for the Derivative Nonlinear Schroedinger Equation with Non-vanishing Boundary Conditions

Conservation laws for the derivative nonlinear Schr6dinger equation with non-vanishing boundary conditions are derived, based on the recently developed inverse scattering transform using the affine parameter technique.  

Electron Momentum Distributions of the Highest Occupied Molecular Orbital of CF3Br： Delocalization of Halogen Lone-Pair Orbitals

The highest occupied molecular orbital (HOMO) of trifluorobromomethane (CF3Br) is studied by binary (e,2e)electron momentum spectroscopy. The experimental momentum profile of the HOMO is compared with the Hartree-Fock (HF) and density functional theory (DFT-B3LYP) calculations. The calculated results largely depend on the size of basis sets rather than theoretical methods. Both the HF and DFT calculations using the 6-311 G^** basis set give a good explanation to the experiment. Delocalization of halogen lone-pair orbitals in the series molecules CF3X (X=F, Cl, Br) has been investigated.  

Threshold of Non－Destructive Pulse for Pt Tip of STM on Graphite Surface

The experimental relationship between width and amplitude of the non-destructive threshold pulse for Pt tip of a scanning tunneling microscope (STM) on graphite surface have been studied strictly and systematically in a wide range of pulse width for the first time. The threshold curve of amplitude versus width indicates that the amplitude of threshold pulse will increase with the decrease of the pulse width. A more rigorous explanation is suggested to interpret the dependence of threshold pulse amplitude on width. Fitted with the experimental data,a new empirical formula is given, extrapolated from which the threshold pulse amplitude will rise to 50 V when the pulse width decreases to 10ns.