Measurement of the Energy Dependence of the Cross Section for the Reaction K+CH3I→ KI+CH3 from 0.1–1 eV

The K + ICH3→ KI + CH3reaction: Interpretation of the product angular and energy distributions in terms of a direct interaction model

“…Calculations performed as outlined in [12] indicate that for qv = 10, fragmentation will begin at 54 kcal/mol and will be complete at 62 kcal/mol ; for qv=30.1, it will begin at 65 and be complete at 93 kcal/mol. Hence it appears that the observed drop in experimental cross section is not due to product fragmentation, but to some dynamical effect which can make itself felt at lower energies, or perhaps to inelastic processes which have their threshold at low energies [5].…”

“…More recently, improved velocity selection techniques indicate that most of the exothermicity becomes translational energy of the products [6]. Experiments with high velocity CH3I beams are also beginning to reveal the dependence of the total reactive cross-section on relative kinetic energy of the reactants [5] and in the near future it ought to be possible to find the dependence of angular and energy distributions on the reactants' kinetic energy. The large amount of experimental data being gathered for this chemical reaction should provide a thorough test of the potential energy surface(s) governing the molecular dynamics.…”

“…The gas phase chemical reaction of potassium atoms with methyl iodide molecules K+ ICH~ +KI + CH, has been studied extensively in molecular beam experiments [1][2][3][4][5]. The broad, backward-peaked angular distribution of KI is characteristic of 'rebound' reactions, for which this particular reaction has served as the prototype [2].…”

K+CH3I→KI+CH3 revisited: the total reaction cross section and its energy and orientation dependence. A case study of an intermolecular electron transfer

“…The maximum in the reaction cross section as the translational energy is increased, as quantitatively expressed by eqn. (25), is due to two opposing physical e †ects. The Ðrst is that with increasing energy there is an increase in the range of impact parameters that lead to reaction and of the steric factor.…”

Tunable Laser Fluorescence Method for Product State Analysis

“…Fortunately there has been much progress in this direction. We now have the ability to produce reactants in known translational states, for example, by supersonic beams (52), in known internal states, for example, by infrared laser excitation (53), and in known spatial orientations, for example, by electric deflection (54). With the use of laser-induced fluorescence, we should be able to observe how the energy of the reactants manifests itself in the various product states.…”