Abstract
The ketene dication, CH2CO2+(1), is accessible buy charge stripping from C2H2O+˙ with Qmin= 18.6 ± 0.1 eV for C2H2O+˙→ C2H2O2+ which is in excellent agreement with the vertical ionization energy of 18.56 eV predicted by ab initio molecular orbital calculations (MP2/6-31G*//4-31G); from isodesmic substitution a heat of formation of 651 kcal mol–1 is estimated for (1) which is also predicted by the ab initio calculations to correspond to the global minimum on the C2H2O2+ potential energy surface followed by the oxirene dication (2) having ΔHf°= 678 kcal mol–1(1 kcal = 4.184 kJ).
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