Observation of N⁺₂3914 Å-Band Emission in Collisions of Singly- and Doubly-Charged Ar, Kr and Xe Ions with N₂at keV Energies

The N + 2 first-negative-band emission ( B 2 Σ + u → X 2 Σ + g ; Δ v =0) has been observed in collisions of Ar q + , Kr q + and Xe q + ( q =1 and 2) with N 2 molecules at the collision energies of 2–8 keV. The relative emission cross-sections for the projectile ions are discussed in connection with the exothermicity of the one-electron capture process, A q + +N 2 →A ( q -1)+ +N + 2 ( B 2 Σ + u ).