
%0 Journal Article
%A Harland, PW 
%A Kim, ND 
%A Petrie, SAH 
%T Kinetic and Electron Impact Studies of the Hco<sup>+</sup>/COH<sup>+</sup> Isomers
%J Australian Journal of Chemistry
%D 0989/01/01
%V 42
%N 1
%P 9-15
%K 
%R https://doi.org/10.1071/CH9890009
%U https://www.publish.csiro.au/paper/CH9890009 
%X The ionization efficiency curve for the CHO+ ion, m/z 29, formed from the near-monochromatic electron impact ionization of CH3OH has been found to exhibit two distinct appearance energies (thresholds) which can be assigned to the formyl, HCO+, and the higher energy isoformyl, COH+, isomers. The energy separation between the appearance energies of 138 kJ mol-1 provides an estimate of the difference between the enthalpies of formation of the formyl-isoformyl isomers. Acetaldehyde undergoes dissociative ionization to yield only the lower energy, formyl, isomer. This has been confirmed from a study of the energetics of the proton transfer reaction of CHO+ on N2O over the centre-of-mass collision energy range 0.3-4 eV measured by using a drift-tube mass spectrometer. 
