| Oxygen, being the second most abundant and essential constituent in our atmosphere and oceans, is of particular interest to researchers in different fields. Its accurate spectroscopic parameters and molecular constants are essential for relevant fields. Therefore, The oxygen molecule (O2) and its ions (O2+) have been extensively studied.The Doppler-limited absorption spectrum of16O2+cation were assigned to the (2,19),(3,20) and (5,21) bands in the Second Negative system (A2Πu-X2Πg),and revised the (4,20) band.All the available lines measured using OH-VMS were group fitted in a nonlinear least-squares fitting procedure and precise molecular constants (Bv, Av, Dv pv qv, γ) were obtained for the involved levels.The available rotational spectra in the second negative system (A2Πu-X2Πg) of16O2+were re-analyzed together with a total of21bands and4250transitions in the range11375-46385cm-1. We examined the wavenumber data obtained from Frourier transform lines and the fluorescence lines, making new assignments when necessary. Including all the bands available, as well as the absorption data from our previous work and three new observed bands, we made a group fitting. Thus, the spectroscopic parameters are determined and reliable vibration constants for the A2Πu (υ’=0,1,6-12,18-21) and X2Πg(υ"=0-6,8) states of16O2+were obtained, and the equilibrium molecular constants for the two electronic states were estimated. |
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