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A theoretical study of the gas-phase chemiionization reactions La + O and La + O2

Todorova, Tanya Kumanova
Dyke, John M.
Published in Journal of Physical Chemistry. A. 2008, vol. 112, no. 34, p. 7825-7830
Abstract The La + O and La + O2 chemiionization reactions have been investigated with quantum chemical methods. For La + O2(X3Σg) and La + O2(a1Δg), the chemiionization reaction La + O2 → LaO2+ + e− has been shown to be endothermic and does not contribute to the experimental chemielectron spectra. For the La + O2(X3Σg) reaction conditions, chemielectrons are produced by La + O2 → LaO + O, followed by La + O → LaO+ + e−. This is supported by the same chemielectron band, arising from La + O → LaO+ + e−, being observed from both the La + O(3P) and La + O2(X3Σg) reaction conditions. For La + O2(a1Δg), a chemielectron band with higher electron kinetic energy than that obtained from La + O2(X3Σg) is observed. This is attributed to production of O(1D) from the reaction La + O2(a1Δg) → LaO + O(1D), followed by chemiionization via the reaction La + O(1D) → LaO+ + e−. Potential energy curves are computed for a number of states of LaO, LaO* and LaO+ to establish mechanisms for the observed La + O → LaO+ + e− chemiionization reactions.
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Research group Groupe Gagliardi
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TODOROVA, Tanya Kumanova et al. A theoretical study of the gas-phase chemiionization reactions La + O and La + O2. In: Journal of Physical Chemistry. A, 2008, vol. 112, n° 34, p. 7825-7830. https://archive-ouverte.unige.ch/unige:3183

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Deposited on : 2009-09-21

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