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Heat of Formation for the Vinyl Alcohol Cation by Photoionization Mass Spectrometry

Threshold photoionization mass spectrometry has been used to measure appearance energies for the formation of C2H4O+• from seven different precursor molecules, resulting in a 298 K cationic heat of formation for the vinyl alcohol cation of 770.6 ± 1.3 kJ mol−1. This leads to a derived experimental value of −114.2 ± 6.1 kJ mol−1 for neutral vinyl alcohol. Both values are in good agreement with high level G2 ab initio calculations.