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An experimental investigation of the light emission being excited by charge transfer collisions between ground level Ne + -ions and molecules of N 2 , O 2 , and CO 2  at collisional energies up to 250 eVolts has shown optical excitation of the molecular ions being formed. The spectral scannings show the main system of N 2  +  and mainly the first negative system of O 2  + . Thus N 2  +  is formed in the excited B 2 Σ u  + -levels and O 2  +  in the b 4 Σ g  - - and to a smaller amount in the A 2 Π u -levels. Both reactions approach energy resonance within 1 to 3 eVolts as far as it is possible following the Franck-Condon principle. The spectral scanniings measured with CO 2  as the target molecule indicate that at almost equal rates CO 2  +  is formed in the Ã 2 II u -levels and by dissociative charge transfer CO +  in the upper A 2 II-levels of the observed comet-tail bands. The energy balance of this dissociative reaction is endothermic within 2,1 eVolts. — The cross sections for the excitation of definite vibrational bands of CO 2  + , CO + , and N 2  +  show threshold energies of several eVolts. After a primary increase the cross sections remain constant over the total energy range up to 250 eVolts. Only for the excitation of N 2  +  a broad maximum between 20 and 30 eVolts was found.

Optische Anregung beim Ladungsaustausch von Ne + -Ionen mit den Molekülen N 2 , O 2 und CO 2 bei Energien unterhalb 250 eVolt