Two- and three-body effects in fast ion-atom collisions: Analogies between photon and charged particle impact

Stolterfoht, N.; Sulik, B.; Tanis, J. A.; Chesnel, J.-Y.; Gulya´s, L.; Fre´mont, F.; Lecler, D.; Hennecart, D.; Husson, X.; Grandin, J. P.; Grether, M.; Koncz, Cs.; Skogvall, B.
February 2000
AIP Conference Proceedings;2000, Vol. 506 Issue 1, p427
Academic Journal
Two- and three-body effects in the emission of low-energy electrons from atomic Li by fast (95 MeV/u) Ar[sup 18+] projectiles are identified and separated experimentally. Cross sections for single electron emission have been measured for electron energies ranging from 3 to 1000 eV and angles ranging from 25° to 155°. Models based on the Born approximation are introduced to separate two- and three-body effects in the angular distributions of the ejected electrons. The two- and three-body processes are associated with Compton scattering and photoabsorption, respectively. Both the high projectile velocity and the use of the Li target are shown to be essential for performing the present analysis. The emission of the 1s electron is attributed mainly to three-body effects. The cross section for three-body processes rapidly decreases with the electronic energy transfer, in accordance with estimations based on the photoabsorption cross sections. Remarkably large contributions from two-body collisions for the low-energy emission of the 2s electrons have been found. © 2000 American Institute of Physics.


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