Fig. 2

Minimum energy paths for the linear approach of CO to HCO+/HOC+ in a), for
the linear approach of N2 to HN in b) and for the
formation of the mixed linear cluster ions N2··· HCO+ and N2H+··· OC in c).
The coordinate displayed on the x-axis is shown with the dotted
line in the chemical formulas and X = O, C.
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