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Heat of formation for the propanoyl cation by photoionization mass spectrometry
Author(s) -
Traeger John C.
Publication year - 1985
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210200311
Subject(s) - photoionization , mass spectrometry , chemistry , standard enthalpy of formation , electron ionization , proton affinity , ionization , ionization energy , thermochemistry , adiabatic process , analytical chemistry (journal) , ion , organic chemistry , physics , thermodynamics , protonation , chromatography
Abstract The ionization energies and [C 3 H 5 O] + appearance energies for a series of oxygenated organic compounds have been measured by dissociative photoionization mass spectrometry. The adiabatic ionization energy for cyclopentanol is observed to be 9.72 eV. A 298 K heat of formation of 591.2±2.3kJ mol −1 , based on the stationary electron convention, is derived for the propanoyl cation in the gas phase. A heat of formation of –86±6 kJ mol −1 is obtained for methylketene, which leads to an absolute proton affinity of 853±8 kJ mol −1 .