Thermal energy charge-transfer reactions - He2(+) with N2 and CO

The reactions of He+2 with N2 and CO at thermal energy have been studied by optical emission spectroscopy in a He flowing afterglow. The following emission systems have been observed: N+2(B 2Σ+u− X 2Σ+g) and CO+(B 2Σ+−X 2Σ+, B 2Σ+− A 2Πi, A 2Πi−X 2Σ+). The vibrational and rotational distributions of the products have been determined. A Franck–Condon‐like vibrational distribution is obtained for N2+(B) and CO+(B) which are formed through energy‐resonant processes. In contrast, the vibrational distribution of CO+(A), which is formed through a nonenergy‐resonant process, is shifted to higher vibrational levels in comparison with Franck–Condon‐type distribution. Simple model calculations are suggestive of mutual effects of Franck–Condon and energy resonance criteria for the formation of CO+(A) vibrational levels. Rotational excitations are observed in N2+(B) and CO+(B). The effective rotational temperatures of N+2(B: v′=0) and CO+(B: v′=0) are 900±60 and 890±100 K, respectively.

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