负离子碰撞脱附研究和EBIT光谱学及QED研究

【作者】 吴师民；

【导师】 邹亚明；

【作者基本信息】 复旦大学 ， 原子与分子物理， 2008， 博士

【摘要】 负离子与原子碰撞的单电子脱附过程是普遍存在于等离子体物理、天体物理、电离层物理学中的重要过程。实验和理论的研究有助于加深我们对于离子与原子作用过程以及负离子结构的认识。因此,这一课题在过去的数十年里得到广泛的研究。本工作采用了增长率方法系统地测量了5-30keV能量范围内,铜负离子与氦、氖、氩、氮;氢、碳、氯(同位素³⁵Cl^-,³⁸Cl^-)、银、铁、铬负离子同氦碰撞的单电子脱附截面;以及银、铁、铬、钛负离子同氮碰撞的单电子脱附截面。我们对实验结果进行了定性的分析,包括铜负离子与不同惰性气体的单电子脱附截面以及不同负离子与同一种惰性气体的单电子脱附截面。从经典的角度来看,负离子与气体原子分子碰撞的单电子脱附截面的大小同一系列的负离子以及靶气体的经典参数有关。本工作的另一部分是基于EBIT的光谱研究以及QED研究。EBIT作为一种研究高电荷态离子的有力工具,这些年被广泛的应用。本工作完成了对可见光谱仪的建设和调试,利用可见光谱仪测定了电子束的半径。对于高电荷态的离子,QED效应是不可忽略的。本工作计算了电子与类氢的铀离子碰撞截面随能量的变化,研究了在共振能量附近,DR和RR过程的干涉。更多还原

【Abstract】 The single electron detachment of negative ions in collision with atoms is known to be one of the most fundamental processes occurring in plasma physics,astrophysics,and ionospheric physics.Experimental and theoretical studies of this collision processes may be used to improve our understanding of ion-atom interaction and the structure of negative ions, thus,this subject has been extensively studied in the past few decades.The growth rate method was used to measure the SED（single-electron detachment） cross sections in this work.The SED cross sections for Cu^- in collision with He,Ne,Ar,N₂;H^-,Ag^-,C^-,Cl^-(isotope ³⁵Cl^-,³⁸Cl^-),Fe^-,Cr^-in collision with He;Fe^-,Ti^-,Cr^-,A^- in collision with N₂ were obtained in the range of 5-30key（incident energy of anion）.The results are qualitatively discussed.The results for Cu^- in collision with different inert gases are compared with each other.The results for He, N₂ in collision with different negative ions are compared with each other. In the view of classical dynamics,the SED cross sections of negative ions in collision with gas atoms and moleculars are determined by some classical parameters of the targets and incident anions.Another part of this work is focus on the Spectrophysics based on the EBIT（electron beam ion traps） and the QED theory.As a powerful tool for the highly charged ions research,EBIT is widely used throughout the world. This work is mainly on the construct and set up of the visible light spectrometer.This spectrometer was successfully used to measure the radius of the electron beam in EBIT.For the highly charged ions,the QED effect can not be disregarded.This work focus on the calculation of the cross-section of the electron-hydrogen like Uranium collision.The interference effect of DR and RR was investigated near the resonant energy.更多还原