Cross sections of Nei+ recoil-ion production through pure ionization, electron loss, and electron capture of projectiles in 1.05-MeV/amu Arq++Ne collisions.

Abstract

The charge-state distributions and production cross sections of Ne recoil ions produced through pure ionization, electron capture, and electron loss processes of projectile Ar ions have been determined for 1.05-MeV/amu ${\mathrm{Ar}}^{\mathrm{q}+}$+Ne (q=4, 6, 8, 10, 12, 14, and 16) collisions using a projectile-ion-recoil-ion coincidence technique. Recoil ions in low charge states, in particular, singly charged ions, are produced predominantly through pure ionization without any change of projectile charge. Electron loss or capture processes of projectiles, though weak relative to the pure ionization, are found to result in an enhancement of the multiply charged recoil ions. The average charge 〈i${\mathrm{〉}}_{\mathrm{q},\mathrm{q}\ensuremath{'}}$ of recoil ions in a specific process, ${\mathrm{Ar}}^{\mathrm{q}+}$+Ne\ensuremath{\rightarrow}${\mathrm{Ar}}^{\mathrm{q}\ensuremath{'}+}$+${\mathrm{Ne}}^{\mathrm{i}+}$, is found to increase with increasing projectile charge q and with the number of the lost or capture electrons from or into projectiles.