title: Determining Rate Constants and Mechanisms for Sequential Reactions of Fe+with Ozone at 500 K.
abstract: We present rate constants and product branching ratios for the reactions of FeOx+(x = 0-4) with ozone at 500 K. Fe+is observed to react with ozone at the collision rate to produce FeO++ O2. The FeO+in turn reacts with ozone at the collision rate to yield both Fe+and FeO2+product channels. Ions up to FeO4+display similar reactivity patterns. Three-body clustering reactions with O2prevent us from measuring accurate rate constants at 300 K although the data do suggest that the efficiency is also high. Therefore, it is probable that little to no temperature dependence exists over this range. Implications of our measurements to the regulation of atmospheric iron and ozone are discussed. Density functional calculations on the reaction of Fe+with ozone show no substantial kinetic barriers to make the FeO++ O2product channel, which is consistent with the reaction's efficiency. While a pathway to make FeO2++ O is also found to be barrierless, our experiments indicate no primary FeO2+formation for this reaction.
authors.affiliation: Department of Chemistry, University of North Florida , 1 UNF Drive, Jacksonville, Florida 32224, United States.
authors.forename: Joshua J
authors.identifier: http://orcid.org/0000-0002-4717-2198
authors.initials: JJ
authors.lastname: Melko
authors.affiliation: Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States.
authors.forename: Shaun G
authors.initials: SG
authors.lastname: Ard
authors.affiliation: Department of Chemistry, University of North Florida , 1 UNF Drive, Jacksonville, Florida 32224, United States.
authors.forename: Trí
authors.initials: T
authors.lastname: Lê
authors.affiliation: Department of Chemistry, University of North Florida , 1 UNF Drive, Jacksonville, Florida 32224, United States.
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Miller
authors.affiliation: Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States.
authors.forename: Oscar
authors.initials: O
authors.lastname: Martinez
authors.affiliation: Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States.
authors.forename: Nicholas S
authors.initials: NS
authors.lastname: Shuman
authors.affiliation: Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States.
authors.forename: Albert A
authors.initials: AA
authors.lastname: Viggiano