Charge-transfer excitation in collisions of slow H+ and ions with CO2 molecules under beam conditions

Charge-transfer reactions of the H+ and H 3 + ions with CO2 were investigated in the (5–1000) eV laboratory energy range of the projectile. The observed luminescent charge exchange processes result in the formation of the electronically excited CO 2 + (A, B) states. The relative chemiluminescence cross-sections for these reactions are measured. The cross-section for the reactions leading to the CO 2 + (A + B) states varies slightly in the (100–1000) eV laboratory energy range and the absolute cross-section is estimated to be of the order of 10−20 cm2. In both cases a decrease of the excitation function was observed for energies up to ∼200 eV, probably due to the formation of long-lived collision complexes.