Charge transfer processes in proton-helium collisions: The validity of the first Born approximation

International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces 2014

Popov, Yu.V.^1,3 ; Galstyan, A.^1,2 ; Chuluunbaatar, O.^3,4 ; Houamer, S.^5 ; Bulychev, A.A.^3 ; Schöffler, M.S.^6 ; Kim, H.-K.^6 ; Titze, J.N.^6 ; Jahnke, T.^6 ; Schmidt, L.Ph.H.^6 ; Schmidt-Böcking, H.^6 ; Dörner, R.^6

Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow

119991, Russia^1

Faculty of Physics, Lomonosov Moscow State University, Moscow

119991, Russia^2

Joint Institute for Nuclear Research, Moscow region, Dubna

141980, Russia^3

School of Mathematics and Computer Science, National University of Mongolia, UlaanBaatar, Mongolia^4

Département de Physique, Faculté des Sciences, Université Ferhat Abbas, Sétif

19000, Algeria^5

Institut für Kernphysik, University Frankfurt, Max-von-Laue-Str. 1, Frankfurt

60438, Germany^6

关键词: Born-series expansion;    Charge transfer mechanisms;    Charge transfer process;    Charge-transfer reactions;    Differential cross section;    Electron-electron correlation;    First Born approximation;    Small scattering angles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/601/1/012008/pdf
DOI  :  10.1088/1742-6596/601/1/012008

来源: IOP

【 摘 要 】

The validity of the Born series expansion for the charge transfer reactions is studied in the case of a proton-helium collision. Three different channels are considered, namely the charge transfer, transfer excitation and transfer ionization. The differential cross sections and the contributions from different charge transfer mechanisms within various Born approximations are compared with experimental data. The role of the electron-electron correlations in the initial helium state is discussed in detail. It is shown that the first Born approximation is valid in the case of reactions under consideration, provided very small scattering angles are involved and the proton energy is >500 keV. It is also shown that the electron-electron correlations in the initial helium state are important only in transfer excitation and transfer ionization reactions.