Charge transfer excitation in H2+Â +Â CO2 collisions under beam conditions

Charge transfer reaction of H2+ 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 CO2+ (A, B) states. The relative chemiluminescence cross sections for these reactions are measured. The cross section value for the reactions leading to the CO2+ (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]+.

99Research highlights► Luminescence spectra from H2+ + CO2 collisions in the (5 ÷ 1000) eVlab energy range were recorded. ► The bands of the B˜2Σu+-X˜2Πg and A˜2Πu-X˜2Πg transitions in all cases can be notice and excitation function was taken. ► Franck-Condon model was tested.