中高能电子散射全截面测量装置的设计  

Design of measure apparatus on total cross sections for intermediate and high energy electron scattering

作　　者：吴兴举[1] 张穗萌[1] 薛新霞[1] 周军[1] 杨欢[1] 

机构地区：[1]皖西学院数理系原子分子物理研究所,六安237012

出　　处：《原子与分子物理学报》2009年第3期513-518,共6页Journal of Atomic and Molecular Physics

基　　金：安徽省自然科学基金(03406203);安徽省教育厅重大科研项目基金(ZD2007002-1);安徽省教育厅自然科学基金(2006KJ267B);省高校拔尖人才专项基金([2003]022)资助的课题

摘　　要：介绍了中高能电子散射全截面绝对测量装置的设计,采用直线透射技术.因采用了恒温控制作用室,以便较准确测量反应室的绝对气压值;同时采用静电型圆柱能量分析器,并用计数率测量模式代替通常的束流强度测量模式,从而可以大幅度减小接收立体角,抑制零度角的弹性散射贡献.通过以上几项措施,可以有效地提高测量的精度,从而可以对一些有意义的分子的中、高能电子散射全截面进行绝对测量.Measure apparatus on absolute total cross sections for intermediate and high energy electron scattering is designed, which is based on linear transmission technique. Constant temperature control chamber is used for measuring absolute pressure in the gas cell accurately. Special attention was paid to avoid errors arising from forward electron scattering. An electrostatic cylindrical energy analyzer was used to eliminate the contribution from forward inelastic scattering. Transmitted electrons were finally detected by a channeltron electron multiplier operating in single-pulse mode instead of usual measuring current intensity, which can reduce the acceptance solid angle and the contribution of elastic scattering in the forward direction can be minimized effectively. The apparatus can be used to measure the absolute total cross sections for electron scattering by some useful molecules in the energy range of 100 ～ 5000eV with high precision.

关 键 词：全截面 电子散射 中高能 装置 

分 类 号：O561.5[理学—原子与分子物理]