Showing papers by "Ivan Powis published in 1979"
TL;DR: In this paper, a photoelectron-photoion coincidence apparatus is described to give more precise data on the distributions of kinetic energy released into translation in the unimolecular dissociations of state-selected ions.
49 citations
TL;DR: In this article, the kinetic energy release in the dissociation of energy-selected acetone ions, obtained by a photoelectron-photoion coincidence technique, was measured and the mean energy releases were found to be in generally good agreement with earlier determinations.
35 citations
TL;DR: In this article, the authors measured the translational energy in the dissociation of energy-selected CH+4 and CD+4 ions by a photoelectron-photoion coincidence experiment.
Abstract: The release of translational energy in the dissociation of energy-selected CH+4 and CD+4 ions is measured by a photoelectron–photoion coincidence experiment. Loss of H and D, respectively, are the principal reactions observed; detailed kinetic energy distributions accompanying the formation of CH+3 and CD+3 are obtained. The surprisal content of these distributions is found to be identical at all ionization energies observed and for both isotopes. A statistical model of the dissociations is considered to be appropriate and a number of calculations are performed. It is found that the use of the Langevin model to describe the effects of the centrifugal barrier to dissociation does not give exact quantitative agreement with the experimental results and this deficiency is examined.
29 citations
TL;DR: In this article, a statistical-dynamical theory incorporating a Langevin model for the ion-induced dipole potential was proposed for the dissociations CF 3 Cl + → CF + 3.
15 citations
TL;DR: In this article, the average kinetic energy releases are much greater than statistical predictions, especially at low parent internal energies, and the energy distributions do not, in general, agree with those calculated from the Klots model.
8 citations