Charge transfer excitation in + CO2 collisions under beam conditions

Charge transfer reaction of H 2 + with CO2 was investigated in the (5 ÷ 1000) eVlab collision energy range. Observed luminescent charge exchange processes lead to the formation of the electronically excited CO 2 + (A, B) states. The relative chemiluminescence cross sections for these reactions are measured. The cross section value for the reactions leading to the CO 2 + (A + B) states is constant in the (100 ÷ 1000) eVlab collision energy range (its estimated value is of the order of 10−18 cm2). A rapid decrease of the excitation function was observed for lowest energies probably due to formation of the long-lived collision complex [H2CO2]+.