Negative Ion Collision Desorption And Ebit Spectroscopy And Qed

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.