Title

Determining Rate Constants and Mechanisms for Sequential Reactions of Fe+ with Ozone at 500 K

Document Type

Article

Publication Date

1-12-2017

Subject Area

ARRAY(0x5577fa399de8)

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 O2 prevent 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+ + O2 product 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.

Publication Title

Journal of Physical Chemistry A

Volume

121

Issue

1

First Page

24

Last Page

30

Digital Object Identifier (DOI)

10.1021/acs.jpca.6b08971

PubMed ID

27996263

ISSN

10895639

E-ISSN

15205215

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