Author(s): Ezzat T.M. Selim, M.A. Rabbih, M.A. Fahmey Ahmad and Ahmed S. Shalbi
Article publication date: 1989-12-01
Vol. 7 No. 3 (yearly), pp. 53-61.
162
Keywords
energy, ions, benzyl derivatives
Abstract
The different processes for formation of [C5H3]+ fragment ion, for a range of 3 eV above threshold, from benzyl alcohol, benzylamine and benzyl cyanide have been suggested and discussed. Appearance energies for the ion have been measured using electron impact technique. The results indicate, that at threshold as well as at higher energies, the [C5H3]+ ion generated from the three precursors is a linear ion. A MNDO SCF method is used to calculate the heats of formation for the linear and cyclic structures of the ion. The substituent effect of -OH, -NH2 and -CN groups on the activation energy as well as excess energy term is also discussed