State-selected angular distributions of single-electron capture in very slowAr4+-Ar collisions

Abstract
The energy-gain spectra and angular distributions for single-electron capture in collisions between Ar4+ and Ar have been measured with a new technique for six laboratory energies in the range 33200 eV. The spectra show that the cross section is dominated by capture to the 4p state of Ar3+, while there is no evidence of capture to the 4s state. For energies below 68 eV, forward scattering is suppressed and strong angular oscillations within the acceptance of ±7° indicate interferences between different paths on the 4p potential curves.

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