Energetics and dynamics of the neutralization of clustered ions in ammonia and water vapour

The onset of diffusion control for ion-ion neutralization in ammonia vapor

“…Thus electron jump between the clustered ions can be ruled out in favor of transfer of a proton, which is strongly exothermic and less likely to leave high-energy NH3 clusters with wrongly oriented dipoles. 25 The clustered NH/-CT ion pairs formed by this process (reaction 17) would probably break NH4+-3NH3 + CT-2NH3 -» 4NH3 + NH4+-CT-NH3 (17) up into HC1 and NH3. (One may note that the amount of HC1 formed during a run under our conditions would have been very small, and NH4C1 did not accumulate on the electrodes.…”

“…where /n and fm are the fractional abundances of clusters of different size. 25 This equation assumes that equilibrium cluster distributions are maintained during ion decay, which is a good approximation for the relatively long ion lifetimes (>2 ms) used. Finally k^' must be modified by adding a term ß to take account of the two-body ion neutralization process, which is the only process at ultralow pressure.5, 13 The proportion of ions undergoing this process at ambient pressure is equal to the fraction which penetrate from rN to the reaction radius for the two-body neutralization, r2, without suffering a collision.…”

Towards a Consistent Chemical Kinetic Model of Electron Beam Irradiation of Humid Air

“…Armstrong [45] and by an elegant experiment by Plastridge et al [46]. In this case, it is assumed that most of the reaction exothermicity is deposited in the newly neutralized anion.…”