Comparative Study of Recoil-Ion Momentum in Ionization of and Capture from He by Partially and Fully Stripped Carbon Ions at Low to Intermediate Velocities

M.A. Abdallah¹, W. Wolff², H.E. Wolf², C.L. Cocke³, M.P. Stöckli³, E. Üdgo³, S. Datz¹

¹ Oak Ridge National Laboratory, Oak Ridge, TN
² U. Federal do Rio de Janeiro, Brazil
³ James R. Macdonald Laboratory, Kansas State University, Manhattan, Ks

Transverse recoil-ion momentum is measured in the collisions of partially and fully stripped Carbon ions with He at low to intermediate velocities. Of special interest is the comparison of these momenta for the processes of single capture from target and single ionization of target in the same collision system. The results show that while the two processes tend to have about the same transverse recoil momentum distribution for fully stripped Carbon (C⁶⁺), they are very different for partially stripped ions (C⁺, C²⁺). For the latter systems the process of ionization yields significantly larger transverse momenta compared to the process of single capture. This indicates that for these systems ionization happens at relatively small impact parameters as compared to capture on average. This is an indication of the role of projectile valence electrons in promoting the target electron to the continuum. More theoretical studies are needed in this field to compare with the experimental results.

Supported by the US DOE; MAA is supported in part by the ORNL Postdoctoral Research Associates Program administrated jointly by Oak Ridge Institute for Science and Education and Oak Ridge National Lab.

 

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