正电子冲击下氦电离三重微分截面的理论计算  

Theoretical calculation of the triple differential cross sections in helium ionization by positron impact

作　　者：周雅君[1] 刘芳 程勇军 王旸[4] 焦利光[5] 马佳 王远程 于荣梅 张永志[9] 姜平辉 柯友启 胡小颖[12] 吴勇[13] ZHOU Ya-Jun;LIU Fang;CHENG Yong-Jun;WANG Yang;JIAO Li-Guang;MA Jia;WANG Yuan-Cheng;YU Rong-Mei;ZHANG Yong-Zhi;JIANG Ping-Hui;KE You-Qi;HU Xiao-Ying;WU Yong(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;College of Science,Harbin University of Science and Technology,Harbin 150080,China;School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119,China;School of physics,Harbin Institute of Technology,Harbin,150080,China;College of Physics,Jilin University,Changchun 130012,China;College of Science,Shenyang Aerospace University,Shenyang 110136,China;College of Physics Science and Technology,Shenyang Normal University,Shenyang 110034,China;College of Physics and Electronic Engineering,Nanyang Normal University,Nanyang 473061,China;College of Physics Science and Technology,Heilongjiang University,Harbin 150080,China;Institute of Computational Atomic and Molecular Physics,College of Science,Heilongjiang Institute of Technology,Harbin 150050,China;School of Physical Science and Technology,Shanghai Tech University,Shanghai 201210,China;College of Science and Laboratory of Materials Design and Quantum Simulation,Changchun University,Changchun 130022,China;Institute of applied physics and computational mathematics,Beijing 100088,China)

机构地区：[1]吉林大学原子与分子物理研究所,长春130012 [2]哈尔滨理工大学理学院,哈尔滨150080 [3]陕西师范大学物理学与信息技术学院,西安710119 [4]哈尔滨工业大学物理学院,哈尔滨150080 [5]吉林大学物理学院,长春130012 [6]沈阳航空航天大学理学院,沈阳110136 [7]沈阳师范大学物理科学与技术学院,沈阳110034 [8]南阳师范大学物理与电子工程学院,南阳473000 [9]黑龙江大学物理科学与技术学校,150080 [10]黑龙江工程学院理学院计算原子与分子物理研究所,哈尔滨150050 [11]上海科技大学物质科学与技术学院,上海201210 [12]长春大学理学院材料设计与量子模拟实验室,长春130022 [13]北京应用物理与计算数学研究所,北京100088

出　　处：《原子与分子物理学报》2020年第6期892-895,共4页Journal of Atomic and Molecular Physics

摘　　要：我们发展了一种处理正电子碰撞原子电离的畸变波Born近似方法,在这个方法中,正负电子偶素通道通过一个ab initio的光学势附加到入射粒子和靶的相互作用势上,且该通道对电离的影响被第一次被考虑在正电子碰撞原子电离的过程中.我们运用这个方法计算了在50 eV入射能量范围氦的电离的三重微分截面,计算结果和实验数据很好的符合.Triple differential cross section for single ionization of atomic helium by positron impact at 50 eV is calculated with the distorted-wave Born approximation.The effect of positronium formation channels is considered for the first time via an ab initio complex potential added to the static distorted potentials.The present results show good agreements with the available experimental measurements.

关 键 词：三重微分截面 正电子冲击 氦原子单电子电离 电子偶数形成 畸变波波恩近似 

分 类 号：O562.5[理学—原子与分子物理]