Single-collision chemiluminescence study of the Ba(1S,3D)+NO2, N2O, O3 reactions

Chemiluminescence from the reactions of Ba ground state 6s2 1S and metastable 6s5d 3D atoms with NO2, N2O, and O3 has been studied under single-collision conditions. Spectra, chemiluminescence cross sections, and photon yields for production of BaO* are reported. In the Ba(3D)+N2O and Ba(1S, 3D)+O3 reactions, a red feature, not previously reported, has been observed and tentatively assigned as BaO D 1Σ+–A 1Σ+ emission. The dynamics of these reactions and the differences between the Ba and lighter alkaline earth atom reactions are discussed.