Electronic-State Distributions of Ne* Formed by Energy Transfer from He(2¹S, 2³S) to Ne at Thermal Energy

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The excitation transfer from He(2 1 S, 2 3 S) to Ne at thermal energy has been studied by observing Ne * emissions from the excited Ne(2p 5 n l ) states in a He flowing afterglow. The Ne(5 s ,5 s ′ ,4 d ) states in the 20.56–20.70 eV region are produced through the He(2 1 S)/Ne reaction, while the Ne(3 p ,3 p ′ ,4 s ,4 s ′ ,3 d ) states in the 18.38–20.05 eV region are formed through the He(2 3 S)/Ne reaction. The initial formation rates and electronic-state distributions of each Ne * state are determined. The excitation-transfer mechanism is discussed on the basis of a reported theoretical prediction from the Landau-Zener curve-crossing model.