Cross-section for the reaction O- + O2 → O2- at relative kinetic energies from threshold to 3 eV

S. L. Lin, J. N. Bardsley, I. Dotan, F. C. Fehsenfeld, D. L. Albritton

Research output: Contribution to journalArticlepeer-review


The cross-section for the charge-transfer reaction of O- with O2 is determined in the relative kinetic energy range from 1 eV (threshold) to about 3 eV, using a combination of experimental and theoretical ion-swarm techniques. Reaction rate constants are measured in a helium-buffered flow-drift tube in the range 50 ≤ E/N ≤ 110 Td, where E is the DC electric field strength, N is the helium gas number density and 1 Townsend (Td) 10-17 V cm2. Velocity distributions are computed using Monte Carlo techniques for O- ions drifting in helium at E/N values in this range. These distributions and the drift-tube rate constants define the reaction cross-section at low collision energies, a region in which it has been difficult to make reliable ion-beam measurements.

Original languageEnglish
Pages (from-to)113-124
Number of pages12
JournalInternational Journal of Mass Spectrometry and Ion Physics
Issue number1-2
StatePublished - Jun 1980
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported in part by the Advanced Research Projects Agency under Contract NOOO-14-76-CO098 and the Defense Nuclear Agency.


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