Multi-Electron Processes in 13C6+ Ionswith Neon Collisions in Energy Region 4.15–11.08 keV/u

Abstract

The cross-section ratios of double-, triple-, quadruple-, and thetotal multi-electron processes to the single electron capture process(σDE/σSC, σTE/σSC, σQE/σSC andσME/σSC) as well as the relative ratios among reactionchannels in double-electron active, triple-electron active andquadruple-electron active are measured in 13C6+–Ne collisionin the energy region of 4.15–11.08 keV/u by employingposition-sensitive and time-of-flight coincident techniques. It isdetermined that the cross-section ratios σDE/σSC,σTE/σSC, σQE/σSC and σME/σSC areapproximately the constants of 0.20±0.03, 0.16±0.04, 0.06±0.02 and 0.42±0.05. These values are obviously smaller than thepredictions of the molecular Coulomb over-the-barrier model (MCBM) [J.Phys. B 23 (1990) 4293], the extended classical over-the-barrier model(ECBM) [J. Phys. B 19 (1986) 2925] and the semiempirical scalinglaws (SL) [Phys. Rev. A 54 (1996) 4127]. However, therelative ratios among partial processes of DE, TE and QE are found todepend on collision energy, which suggests that the collision dynamicsdepends on the collision velocity. The limitation ofvelocity-independent character of ECBM, MCBM and SL is undoubtedlyshown.