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Velocity space "snapshots" of continuum electrons produced by slow, bare, highly charged ions: saddle-point electrons?

Comprehensive velocity-space "snapshots" of the electron continua produced by the impact of ions on He at a projectile velocity of 1.63 a.u. have been measured for the bare projectiles of p, He, C, O and Ne. For the three highly charged ions, this velocity lies in the "ionization threshold" region where electron capture dominates the reaction. The experimental technique projects the distribution of soft continuum electrons onto a two-dimensional detector in such a way that the velocity-space distribution for all electrons with laboratory energies in the range from 0-30 eV is accurately imaged. The data show no evidence for a saddle-point feature for the highest three projectile charges.