Possible Evidence of 3rd and 4th order Interactions Contributions to Double Ioni- zation of Helium by Protons and Antiprotons

29th International Conference on Photonic, Electronic, and Atomic Collisions

Santos, A.C.F.^1 ; Dubois, R.D.^2 ; Manson, S.T.^3

Institute de Física, Universidade Federal Do Rio de Janeiro, PO 68528, Rio de Janeiro, RJ

21941-972, Brazil^1

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

MO

65409, United States^2

Department of Physics and Astronomy, Georgia State University, Atlanta

GA

30303, United States^3

关键词: Double ionization;    Negative coefficients;    Protons and antiprotons;    Velocity dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/2/022017/pdf
DOI  :  10.1088/1742-6596/635/2/022017

来源: IOP

【 摘 要 】

Published cross sections for double ionization of helium by protons and antiprotons are analyzed in terms of the traditional interference between 1stand 2ndamplitudes. Between 3 and 10 a.u., the velocity dependence implies a dominant 2ndorder interaction. For slower collisions it is shown that the velocity dependences are consistent with 3rdand 4thorder interactions becoming important with these interactions having negative coefficients.