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Recoil-ion momentum distribution for Transfer Ionization in fast proton-He collisions
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2005 In: Phys. Rev. A, Vol. 72, no 012713Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2005. Vol. 72, no 012713
URN: urn:nbn:se:su:diva-24664OAI: diva2:198046
Part of urn:nbn:se:su:diva-732Available from: 2005-11-09 Created: 2005-11-09Bibliographically approved
In thesis
1. Electron-transfer processes in fast ion-atom collisions
Open this publication in new window or tab >>Electron-transfer processes in fast ion-atom collisions
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The subject of this thesis is experimental studies of electron-transfer processes in ion-atom collisions at velocities significantly higher than typical orbital velocities of electrons in bound states of atoms or molecules. The experimental technique applied combines the high beam intensity of heavy-ion storage rings with a supersonic gas-jet target equipped with a recoil-ion-momentum spectrometer. In singleelectron capture to fast protons from helium atoms, we have for the first time achieved a complete separation of the kinematic and Thomas transfer mechanisms and are able to perform a quantitative comparison with the many theoretical results on a much more detailed level than what was previously possible. For the process of transfer ionization in proton-helium collisions we have determined the velocity dependence of the Thomas transfer ionization cross section to be the expected vp-11 when the projectile velocity, vp, is sufficiently high. Further, we have determined the velocity-dependent probability for shake-off of the second electron from helium provided that the first one is transferred in a kinematic capture process. Finally, we have considered collisions between protons and hydrogen molecules. Here we have found a strong variation in the cross section for transfer and excitation processes when the angle between the direction of the incoming projectile and the internuclear axis of the target molecule is varied. The variation can be explained as a result of quantum mechanical interference related to the two indistinguishable atomic centers of the molecule.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2005. 59 p.
Electron transfer processes fast ion atom collisions hydrogen helium
National Category
Atom and Molecular Physics and Optics
urn:nbn:se:su:diva-732 (URN)91-7155-165-4 (ISBN)
Public defence
2005-12-05, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
Available from: 2005-11-09 Created: 2005-11-09Bibliographically approved

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