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Abstract
The reactions of O22+ with CH4, C2H2 and C2H4 have been investigated for the first time, using a position-sensitive coincidence technique, at centre-of-mass collision energies close to 4eV. The experiments show these interactions yield a wide variety of products which involve the formation of new chemical bonds. The mechanisms of these bond-forming reactions have been investigated by examining the correlations between the velocities of the reactant and product ions which are revealed by the coincidence data. Many of the bond-forming reactions occur via the stripping of an atom (or group of atoms) from the neutral by the O22+ reactant, while other reactions clearly involve the initial formation of a collision complex which then fragments to form the detected products.
Highlights
From a fundamental viewpoint O22+ is one of the simplest molecular dications
In this paper we report the first study of the reactions of the molecular oxygen dication with three simple organic molecules methane (CH4), ethyne (C2H2) and ethene (C2H4)
We have previously studied the reaction of Ar2+ + C2H2 using our position sensitive coincidence (PSCO) spectrometer, the same apparatus that we employ for the studies reported in this paper [12]
Summary
From a fundamental viewpoint O22+ is one of the simplest molecular dications. Establishing a detailed understanding of the reactivity of O22+ is an important step towards predicting and accounting for the reactivity of larger dications. Given the potential atmospheric importance of O22+, we have begun a series of investigations of the reactions of O22+ with a variety of small neutral species [4,5]. In this paper we report the first study of the reactions of the molecular oxygen dication with three simple organic molecules methane (CH4), ethyne (C2H2) and ethene (C2H4). These investigations were performed using a coincidence technique that, as well as identifying the reaction products, probes the dynamics of product formation in these dication-neutral reactions.
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