Issue 16, 1997

Chemiionization reactions of Mg, Ca, Sr and Ba with O2(X3Σg-), O2(a1Δg) and O(3P)

Abstract

The associative ionization reactions of Mg, Ca, Sr and Ba with O 2 (X 3 Σ g - ), O 2 (a 1 Δ g ) and O( 3 P) have been investigated with chemiion and chemielectron spectroscopy. The spectrometer used has been described, and the results obtained have been rationalized in terms of possible exothermic associative ionization reactions and the ground states of the oxides MO and MO 2 known from experimental and theoretical evidence. For magnesium, no associative ionization was observed under any conditions. For M=Ca, Sr and Ba reacted with O 2 (X 3 Σ g - ), the results obtained indicate that M 2 O 2 + is a primary chemiion formed via an M+MO 2 * reaction. In the presence of O 2 (a 1 Δ g ) and O( 3 P), the chemiion and chemielectron intensities were greatly reduced. An explanation, based on known neutral reactions for the three metals, is proposed. The main chemiion observed in the presence of discharged oxygen is M 2 O + arising from the reaction sequence The implications of these results for atmospheric chemistry are discussed.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1997,93, 2631-2636

Chemiionization reactions of Mg, Ca, Sr and Ba with O2(X3Σg-), O2(a1Δg) and O(3P)

J. M. Dyke, A. M. Shaw and T. Veszpremi†, J. Chem. Soc., Faraday Trans., 1997, 93, 2631 DOI: 10.1039/A701389B

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