Structures And Triple Differential Cross Sections For Proton-impact Single Ionization Of Helium

Three-Coulomb wave function (3C) model is applied to study singleionization of helium by 75 keV proton impact. Triple differential crosssections (TDCS) are calculated. And then the calculation results ofinterference effect and contributions of various interactions to theTDCS are analyzed. This thesis consists of four parts.The first part introduces the basis concepts about ion–atomcollisions and general situation at home and abroad.The second part introduces several theoretical models:continuum distorted wave-eikonal initial state (CDW-EIS),three-body distorted wave (3DW) and 3C model.The third part, the present results are compared withexperimental data and other theoretical predictions from 3DWresults by Schulz et al. and CDW-EIS results by Schulz et al. We findthat the experimental results are basically qualitatively reproducedby the CDW-EIS, 3DW and 3C theoretical results. And the minimum atzero is qualitatively reproduced by the 3C model in the perpendicularplane, whereas other theoretical models do not. The importance ofthe interaction of projectile-ionized electron and projectile-targetcore are analyzed, respectively.Furthermore, the contributions of various scattering amplitudes to TDCS in present model are discussed. And then the physical originof the features in the TDCS has been explained.The fourth part gives the conclusion.