Mutual neutralization of He+ with the anions Cl−, Br−, I−, and SF6−
Abstract
Mutual neutralization (MN) rate coefficients kMN for He+ with the anions Cl−, Br−, I−, and SF6− are reported from 300 to 500 K. The measured rate coefficients may contain a contribution from transfer ionization, i.e., double ionization of the anion. The large rate coefficient for He+ + SF6− (2.4 × 10−7 cm3 s−1 at 300 K) is consistent with earlier polyatomic MN results found to have a reduced mass dependence of μ−1/2. Neutralization of He+ by the atomic halides follows the trend observed earlier for Ne+, Ar+, Kr+, and Xe+ neutralized by atomic halides, kMN (Cl−) < kMN (Br−) < kMN (I−). Only an upper limit could be measured for the neutralization of He+ by Cl−. Predictions of the rate coefficients from a previously proposed simple model of atomic–atomic MN results are consistent with the present He+–halide rate coefficients. The temperature dependences are modestly negative for Br− and I−, while that for SF6− is small or negligible.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 28, 2016
- Source ID
- 10.1063/1.4948637
Entities
People
- Albert A Viggiano
- Justin P. Wiens
- Nicholas S Shuman
- Thomas M Miller
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory