Abstract
Using the time-of-flight technique [1-6], the absolute total one-electron-capture cross sections were
measured for the O₂⁺ ions in slow collision with O₂ and N₂ molecular gases in the energy range
0.50 - 2.0 keV. These electron-capture cross sections are found to be in the range of
1.06 - 2.54 x10^-16 cm² for O₂⁺ + O₂
collision and 0.67 - 2.54 x10^-16cm² for O₂⁺+ N₂
collision [4], and show a monotonically increasing behavior with increasing incident energy.
Absolute total-electron-capture cross sections for low-energy O₂⁺ ions in slow collision with O₂ and N₂
molecular gases are reported. These measurements of low-energy electron-capture cross sections
can be used as a benchmark for the predictions of theoretical models. Accurate theoretical
calculations that cover wide range of energy are still needed to evaluate the present measurements.
A survey of the literature revealed that a few measurements of this kind had been made and when
available the electron-capture cross sections were measured mainly for recoil ion in collision
with inert and hydrogen gases. The multi-electron systems are almost intractable in any model
calculations, therefore the present measurements of the single-electron-capture cross sections
are not compared with any model calculation.

References