Abstract
Laser ablation of transition metals with concurrent codeposition of C2H2/O2/Ar mixtures at 11 K produced metal independent absorptions at 1493.1 cm−1. On the basis of isotopic shifts and splittings, enhancement in doping with electron trapping gas, and quantum chemical frequency calculations, the band is assigned to the O–O stretching vibration of the C2H2O2+ cation, which was predicted to have a 2A″ ground state with a nonplanar Cs symmetry.
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