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Theoretical study of the gas-phase chemiionization reactions La+O and La+O-2

机译:气相化学电离反应La + O和La + O-2的理论研究

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The La + O and La + O-2 chemiionization reactions have been investigated with quantum chemical methods. For La + O-2(X-3 Sigma(g)) and La + O-2(a(1)Delta(g)), the chemiionization reaction La + O-2 -> LaO2+ + e(-) has been shown to be endothermic and does not contribute to the experimental chemielectron spectra. For the La + O-2 (X-3 Sigma(g)) reaction conditions, chemielectrons are produced by La + O-2 -> 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(P-3) and La + O-2(X-3 Sigma(g)) reaction conditions. For La + O-2(a(1)Delta(g)), a chemielectron band with higher electron kinetic energy than that obtained from La + O-2 (X-3 Sigma(g)) is observed. This is attributed to production of O(ID) from the reaction La + O-2(a(1)Delta(g)) - LaO + O(ID), followed by chemiionization via the reaction La + O(D-1) -> 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(-) chermionization reactions.
机译:已经用量子化学方法研究了La + O和La + O-2化学电离反应。对于La + O-2(X-3 Sigma(g))和La + O-2(a(1)Delta(g)),化学离解反应La + O-2-> LaO2 + + e(-)为证明是吸热的,对实验化学电子光谱没有贡献。对于La + O-2(X-3 Sigma(g))反应条件,通过La + O-2-> LaO + O,然后是La + O-> LaO + + e-产生化学电子。从La + O(P-3)和La + O-2(X-3 Sigma(g)均可观察到,这是由La + O-> LaO + + e(-)产生的相同化学电子带所支持的。 )反应条件。对于La + O-2(a(1)Delta(g)),观察到电子动能比从La + O-2(X-3 Sigma(g))高的化学能带。这归因于由La + O-2(a(1)Delta(g))-LaO + O(ID)反应生成O(ID),然后通过La + O(D-1)反应进行化学电离-> LaO ++ + e(-)。计算LaO,LaO *和LaO +的多个状态的势能曲线,以建立观察到的La + O-> LaO + + e(-)化学化反应的机理。

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