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Published June 30, 1994 | metadata_only
Journal Article

Guided ion beam studies of reactions of alkaline earth ions with O_2


The endothermic reactions of Mg^+ and Sr^+ with O_2 are studied in a guided ion beam mass spectrometer. Analysis of the reaction thresholds are used to obtain 0 K bond dissociation energies of MgO^+ (2.50 ± 0.10 eV) and SrO^+ (3.47 ± 0.06 eV), which are compared with other literature values. Analysis of these reaction cross sections and those previously published for the reaction of Ca^+ with O_2 [E.R. Fisher, J.L. Elkind, D.E. Clemmer, R. Georgiadis, S.K. Loh, N. Aristov, L.S. Sunderlin, and P.B. Armentrout, J. Chem. Phys., 93 (1990) 2676] suggests that there are both thermodynamic and impulsive reaction pathways. The latter play an increasingly important role in the reaction dynamics as the mass of the alkaline earth ion increases.

Additional Information

© 1994 Elsevier. (Received 25 January 1994; accepted 23 March 1994) We thank E. Murad for helpful comments, C. W. Bauschlicher for communicating results before publication, and a referee for his comments. This work is supported by the National Science Foundation, grant number CHE-9221241.

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August 22, 2023
August 22, 2023