Reaction mechanism for the oxidation of free silver dimers

Liana D. Socaciu, Jan Hagen, Ueli Heiz, Thorsten M. Bernhardt, Thomas Leisner, Ludger Wöste

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The kinetics of the interaction of Ag2+ with O2 is studied in the gas phase under multi-collision conditions at various temperatures. A new experimental scheme is employed, which consists of an octopole ion trap of variable temperature inserted into a tandem quadrupole mass spectrometer. From the time evolution of the reactant and product molecule concentrations at different temperatures the corresponding reaction mechanism is extracted. Surprisingly, the product Ag2O+ is detected, which is formed after molecular adsorption and dissociation of O2. We can clearly identify Ag2O2+ as an intermediate in this reaction. In addition, absolute rate coefficients and activation energies for the molecular adsorption of O2 onto Ag2+ are presented.

Original languageEnglish
Pages (from-to)282-288
Number of pages7
JournalChemical Physics Letters
Volume340
Issue number3-4
DOIs
StatePublished - 1 Jun 2001
Externally publishedYes

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