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Electron-impact ionization of Ar 9+

par Laghdas, K.;Joachain, Charles ;Reid, Robert Henderson G;Burke, Philip P.G.
Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 28, 22, page (4811-4822)
Publication Publié, 1995-11

Article révisé par les pairs

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Résumé :

We have calculated total and single differential cross sections for electron-impact ionization of Ar 9+ in its ground (1s 22s 22p 5) 2p 0 state by using a method that combines the distorted-wave Born approximation and the R-matrix theory. The incident and the scattered electrons are described by distorted waves, while the wavefunctions of the initial ground state of the Ar 9+ ion and its final continuum state (Ar 10++e -) are calculated by using the R-matrix approach. This allows us to take into account the excitation-autoionization process. Five states of the final Ar 10+ ion, namely 1s 22s 22p 43P, 1D, 1S and 1s 22s2p 53P 0, 1P 0, have been included in our calculation. Up to the 24-pole components of the interaction with the ionizing electron were included, exciting ten distinct Ar 9+ continuum symmetries. The single differential cross sections exhibit considerable structure due to autoionizing resonances. Total cross sections for production of Ar 10+ in each of the five states are presented for impact energies from the threshold energy at 17.6 to 100 au. Our theoretical values for the total cross section are in fair agreement with the experimental results. © 1995 IOP Publishing Ltd.