A photoion–photoelectron coincidence study of (CO)2

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Abstract
The photoion–photoelectron coincidence (PIPECO) spectrum for (CO)+2 has been measured in the wavelength region of ∼600–1 000 Å. The lower limits for the bond dissociation energies of CO+ (X̃)⋅CO, CO+ (Ã)⋅CO, and CO+ (B̃)⋅CO are determined to be 29.8, 17, and 16 kcal/mol, respectively. Evidence supporting the existence of long‐lived (CO)+2 states with dissociation lifetimes >40 μs at energies above the CO+ (X̃,v=0)+CO asymptote is found. The dissociative lifetimes of CO+ (Ã)⋅CO and CO+(B̃)⋅CO are estimated to be longer than 4 μs and 50 ns, respectively.