Ionization-excitation of helium into the np ( n = 2−5) states

Cross sections for the simultaneous ionization and excitation to the np states ( n = 2−5) of the helium atom by fast proton and antiproton impact have been calculated. We have applied the impact parameter method and have used second-order perturbation approximation. Electron correlation has been tak...

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Bibliographic Details
Published in:Physics letters. A 1999-03, Vol.252 (6), p.321-327
Main Authors: Nagy, L., Mezei, J.Zs
Format: Article
Language:English
Subjects:
Helium atom
Ion-atom collisions
Ionization-excitation
Multi-electron transitions
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Summary:Cross sections for the simultaneous ionization and excitation to the np states ( n = 2−5) of the helium atom by fast proton and antiproton impact have been calculated. We have applied the impact parameter method and have used second-order perturbation approximation. Electron correlation has been taken into account in the initial state but has been neglected in the final state. Our cross sections are compared to the experimental data.
ISSN:0375-9601
1873-2429
DOI:10.1016/S0375-9601(98)00963-3