电子碰撞原子电离截面的理论研究  

Ionization cross sections by electron impact for single ionization from the atomic ground state

作　　者：易有根[1] 葛树明[1] 江少恩[2] 唐永建[2] 郑志坚[2] 

机构地区：[1]中南大学物理科学与技术学院,湖南长沙410083 [2]中国工程物理研究院高温高密度等离子体物理国家重点实验室,四川绵阳621900

出　　处：《湖南文理学院学报（自然科学版）》2010年第4期19-25,共7页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：国家自然科学基金(10275056);国防科技重点实验室基金(51480010104ZS7702)

摘　　要：利用三参数经验公式,研究了自由原子基态单次电离的电子离子碰撞电离截面,在入射电子能量域值和1keV附近,所有的电子离子碰撞电离截面的实验数据和计算结果符合得很好,通常误差小于20%.在靠近域值附近误差为40%,电子离子碰撞电离截面的计算中没有考虑到精细结构的计算.其计算结果可用来模拟激光等离子体的快电子能谱和产额,且可为一些电子仪器的制造提供十分精确的电子碰撞电离截面参数.Using the empirical formula with three free parameters recently proposed,ionization cross section are given for the representation of cross sections for single ionization of free atoms from the ground stages by electron impact.Almost all experimental results can be approximated by this formula with 20% over the whole energy range between threshold and 1 keV.All experimental results can be approximated with experimental error.The formula proposed is not suitable to reproduce the exact contour of fine structure in the ionization cross section curve.The probable error is estimated to be approximately 20%,but near threshold the error is larger than 40% and no fine structures are accounted for.

关 键 词：电离 电子碰撞 电离截面 

分 类 号：O571.4[理学—粒子物理与原子核物理]