Abstract

The extensive bands observed from the helium afterglow reaction of SO 2 in the 250–540 nm region are assigned to the new SO +(A 2Π-X 2Π r) system produced from the He +/SO 2 dissociative charge-transfer reaction at thermal energy. They had been erroneously interpreted as the SO + 2 (C̃-X̃) system produced from He(2 3S)/SO 2 Penning ionization. The spectroscopic constants for the SO +A 2Π) and SO +(X 2Π r) states were determined.

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