Using pulse radiolysis techniques, rates of recombination of electrons with Het ions in the presence of helium over a wide pressure range (40-900 Torr) and at temperatures of 200, 235, 275, and 295 K were measured. Two-and three-body recombination processes were resolved, and a temperature dependence for the three-body recombination rate constant of T(;;;.2.9± 1.2) observed. This result agrees well with theoretical predictions of a temperature expo~ent of -2.5 by Bates and Khare and Pitaevskii, and remarkably well with recent work by Cao and Johnsen which gave a temperature exponent of -2.9 for the rate constant for three-body recombination of electrons with simple molecular ions in the presence of helium.
Pulse radiolysis studies of ion-electron recombination in helium. Pressure and temperature effects Using pulse radiolysis techniques, rates of recombination of Art ions with electrons in bulk argon were measured over a wide pressure range (150 to 1065 torr) at bulk gas temperatures of 295, 335, and 375 K. No pressure dependence for the total recombination rate constant was observed at any temperature studied. This observation is consistent with the model, whereby the encounter pair is stabilized by electron energy loss while in the Coulomb field of the cation. The presence of a Ramsauer minimum in the electron/argon atom momentumtransfer cross section versus energy profile means that, at low energies, energy loss is very slow. The neutral-assisted three-body recombination mechanism in argon does not significantly enhance the total rate of recombination above the two-body rate.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.