Single and double over-barrier ionization of He, He+ and Ne system by positron impact
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, P.R. China
Received: 7 August 2016
Received in final form: 22 March 2017
Published online: 22 June 2017
The classical over-barrier ionization model (COBI) method and trajectory calculations were utilized to simulate the ionization of He+ impacted by a positron. The calculated ionization cross sections of He+ agree with other theoretical data. Additionally, we found that the double ionization of He has a definite association with the positron-He+ impact. This result can explain why doubly ionized He seemed to be positron-scattered by the rest of the He+ in our previous study. The COBI model was also extended to study the double ionization caused by positron-Ne impacts. Our theoretical results agree with the experimental data.
Key words: Molecular Physics and Chemical Physics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2017