Rate constants for the reaction of O+ with NO as a function of temperature (300-1400 K)

Itzhak Dotan, A. A. Viggiano

Research output: Contribution to journalArticlepeer-review


We have measured the rate constants for the reaction of O+ ions with NO from room temperature to 1400 K. The reaction is slow (k = 8 × 10-13 cm3 s-1) at room temperature and the rate constant increases to 2.6× 10-12 cm3 s-1 at 1400 K. Comparison of the high-temperature data to drift tube data shows that rotational and translational energy are equally effective at controlling the rate constant, and that vibrational energy has at most a small effect on reactivity. Analysis of the data shows that the reaction proceeds by three different mechanisms. At the very low temperatures, we find a complex formation mechanism, and at the medium temperature range the behavior is interpreted to be a consequence of the correlation of O+(4S) and NO(2Π) with the excited states 3A1, 3B1 of NO+2, which lie slightly above the reactants in energy. At the very high energy range, a third mechanism becomes important, probably the endothermic production of NO+(3Σ+).

Original languageEnglish
Pages (from-to)4730-4733
Number of pages4
JournalJournal of Chemical Physics
Issue number10
StatePublished - 8 Mar 1999


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