Abstract
In continuation of the first part of the work containing the rotational analysis of 10 sub-bands belonging to the progression v1=0 of the Πu2Πg2 band system of CO2+, 24 new sub-bands were analyzed. These bands belong to the progressions v1 and v1=2. It was found that the substate Π32g2, v1=1 is split into two levels, the splitting being probably caused by an interaction (resonance) with some other unidentified substate (very probably one of the vibronic substates corresponding to two quanta of bending vibration). A similar splitting was found in the substate Π32u2, v1=4. Weaker perturbations, manifested by anomalous B values, Λ-doubling increasing proportionally to about J2.5, and shifts of vibrational levels were detected in several other vibrational levels. A selection rule forbidding transitions between vibrational levels showing opposite perturbation shifts in the vibrational energy has been found. The new constants obtained are: ΔGa1=1241.77, ΔGb1=1287.32, ΔGb2=1209.55 (all Π32g2). ΔG1=1265.75, ΔG2=1256.89 (Π12g2); ΔGa4=1062.50, ΔGb5=1055.25, ΔG6=1103.97 (Π32u2); ΔG5=1108.50, ΔG6=1106.99 (Π12u2). Further, for Π32g2, Ba1=0.3754, Bb1=0.3814, B2=0.3769; for Π12g2, B1=0.3803, B2=0.3793; for Π32u2, Ba4=0.3421, B5=0.3427, B6=0.3417; for Π12u2, B5=0.3460, B6=0.3458. The values of the constants reported in Part I are corrected and the Λ-doubling for all levels is evaluated. Formulas for unperturbed values of B (both substates Π322 and Π122 are: Πg2Bv=B00.0012v1, Πu2Bv=B00.0011v1; for unperturbed zero band lines νvv=ν00+1131v13v1(v1+1)1280v1+7.25v1(v1+1).

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