Integral cross section measurements and product recoil velocity distributions of Xe2+ + N2 hyperthermal charge-transfer collisions

• Published in: The Journal of chemical physics 2016-07, Vol.145 (4)
• Main Authors: Hause, Michael L., Prince, Benjamin D., Bemish, Raymond J.
• Format: Article
• Language: English
• Subjects: Cation exchanging; Charge exchange; Charge transfer; Cross-sections; Electron states; Integrals; Ions; Rare gases; Recoil; Simulation; Velocity
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.4959135

Charge exchange from doubly charged rare gas cations to simple diatomics proceeds with a large cross section and results in populations of many vibrational and electronic product states. The charge exchange between Xe2+ and N2, in particular, is known to create N 2 + in both the A and B electronic states. In this work, we present integral charge exchange cross section measurements of the Xe2+ + N2 reaction as well as axial recoil velocity distributions of the Xe+ and N 2 + product ions for collision energies between 0.3 and 100 eV in the center-of-mass (COM) frame. Total charge-exchange cross sections decrease from 70 Å2 to about 40 Å2 with increasing collision energy through this range. Analysis of the axial velocity distributions indicates that a Xe2+ − N2 complex exists at low collision energies but is absent by 17.6 eV COM. Analysis of the axial velocity distributions reveals evidence for complexes with lifetimes comparable to the rotational period at low collision energies. The velocity distributions are consistent with quasi-resonant single charge transfer at high collision energies.