Emission of 3914-ÅN2+radiation from charge-transfer excitation

Using various projectile ions incident on an ${\mathrm{N}}_2$ gas target, we have determined cross sections for the ${\mathrm{N}}_2^{+}$ 3914-Å emission in coincidence with charge transfer from ${\mathrm{N}}_2$ molecules to the projectiles. Ions of H and the inert gases, each in the energy range 10 to 100 keV, were used. As in charge transfer in which target and projectile are left in the ground state, the velocity at which the maximum cross section occurs increases as the magnitude of the potential energy change increases. Unlike the ground-state case, the value of the cross section at a fixed velocity is significantly greater for an exothermic reaction than for an endothermic reaction having the same magnitude of $\Delta E$.