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Abstract |
The He^+ and He^+_2 ions are involved as active ionic species in a helium afterglow. Although it was difficult to separate the He^+ reaction from the He^+_2 one, a new convenient method to isolate the... He^+ reaction is presented here. In our method, Ar, whose rate coefficient for He^+_2 is much larger than that for He^+, was premixed with the He flow to remove He^+_2 ions efficiently. This method was successfully applied to the formation of N^+_2(B^2Σ^+) by the He^+ + N_2 reaction at thermal energy.show more
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