Heat of formation for the vinyl alcohol cation by photoionization mass spectrometry

Eur. J. Mass Spectrom. 5, 319–324 (1999)
DOI: 10.1255/ejms.291

Heat of formation for the vinyl alcohol cation by photoionization mass spectrometry

John C. Traeger^* and Milisav Djordjevic
Department of Chemistry, La Trobe University, Bundoora, Victoria 3083, Australia

ABSTRACT:

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.

Keywords: vinyl alcohol, photoionization, appearance energy, heat of formation

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