Differential Cross Sections for Ionization of Argon by 1 keV Positron and Electron Impact

28th International Conference on Photonic, Electronic and Atomic Collisions

Gavin, J.^1 ; Dubois, R.D.^1 ; Lucio, O. G. De^2

Department of Physics, Missouri University of Science and Technology, Rolla

MO

65409, United States^1

Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, México D.F.

01000, Mexico^2

关键词: Differential cross section;    Differential information;    Ejected electrons;    Many-body interactions;    Positron impacts;    Projectile energy;    Scattering angles;    Single ionization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/488/1/012058/pdf
DOI  :  10.1088/1742-6596/488/1/012058

来源: IOP

【 摘 要 】

Differential information was generated by establishing coincidences and imposing conditions on data recorded for target ions, scattered projectiles, and ejected electrons, as a function of projectile energy loss and scattering angles; in order to describe the interaction between a positron (electron) 1 keV beam and a simple Ar jet. Single ionization triply differential cross section (TDCS) results exhibit two distinct regions (lobes) for which binary (events arising from 2-body interaction) and recoil (events which can only be produced by many-body interactions) interactions are associated. Results indicate that binary events are significantly larger for positron impact, in accordance with theoretical predictions. A similar feature is found for different energy losses and scattering angles. Intensity of the recoil lobe for both projectiles, positron and electron, is observed to depend on the energy loss and scattering angle. Also, it can be noticed that for positron impact the recoil interactions intensity is larger than that observed for electron impact.