By employing the sequential electric field pulsing scheme for vacuum ultraviolet (VUV) laser pulsed field ionization-photoion (PFI-PI) detection, we have successfully recorded the spin-orbit and rovibronic state resolved VUV-PFI-PI spectra for O₂⁺(a⁴Π_{u5/2,3/2,1/2,-1/2}: ν⁺ = 0-2; J⁺) and O₂⁺(X²Π_g3/2,1/2: ν⁺ = 21-23; J⁺), indicating that O₂⁺(a⁴Π_u) and O₂⁺(X²Π_g) ions in these spin-orbit and rovibronic states can be prepared for ion-molecule collision studies. The present experiment is concerned with the measurement of absolute integral cross sections (σ's) of the charge transfer reactions, O₂⁺(a⁴Π_{u5/2,3/2,1/2,-1/2}: ν⁺ = 1, 2; J⁺) [O₂⁺(X²Π_g1/2,3/2: ν⁺ = 22, 23)] + Ar → Ar⁺ + O₂. The fact that the O₂⁺(a⁴Π_{u5/2,3/2,1/2,-1/2}: ν⁺ = 1) and O₂⁺(X²Π_g3/2,1/2: ν⁺ = 22) [O₂⁺(a⁴Π_{u5/2,3/2,1/2,-1/2}: ν⁺ = 2) and O₂⁺(X²Π_g3/2,1/2: ν⁺ = 23)] states are in close energy resonance, makes these reactions ideal model systems for investigating the energy resonance and Franck-Condon factor (FCF) effects on the charge transfer reactivity of O₂⁺. The σ(a⁴Π_{u5/2,3/2,1/2,-1/2}: ν⁺ = 1, 2) values are found to be about ten-fold higher than the σ(X²Π_g3/2,1/2: ν⁺ = 22, 23) values at E_cm = 0.05-10.00 eV, indicating that the FCFs play a predominant role in promoting these charge transfer reactions. The present ion-molecule reaction study also shows that σ(a⁴Π_u) depends strongly on the spin-orbit as well as the vibrational states with the order: σ(a⁴Π_u: v⁺ = 2) > σ(a⁴Π_u: v⁺ = 1), and σ(a⁴Π_u5/2: v⁺) > σ(a⁴Π_u3/2: v⁺) > σ(a⁴Π_u1/2: v⁺) > σ(a⁴Π_u-1/2: v⁺), where v⁺ = 1 and 2. The high σ(a⁴Π_{u5/2,3/2,1/2,-1/2}: v⁺ = 1, 2) values, along with their decreasing trend with increasing E_cm, are consistent with those expected for a long range charge transfer mechanism. However, the low σ(X²Π_g3/2,1/2: ν⁺ = 22, 23) values and the lack of E_cm-dependence observed in the E_cm range of 0.05-10.00 eV point to the involvement of short-range collision dynamics.