Lifetime of vibrational levels of the A 2Π and B 2Σ+ states of CO+

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Abstract
The radiative lifetimes of the A 2Π (v′ = 1–5) and B 2Σ+ (v′ = 0–2) states of CO+ have been measured by means of the delayed coincidence method. Excitation has been performed by a pulsed electron beam incident on CO. For the lifetime measurements of vibrational levels of the A 2Π state, particular attention has been paid to collisional quenching and electrostatic repulsion. The results of these measurements are 3.25±0.4 μs (v′ = 1), 3.04±0.17 μs (v′ = 2), 2.79±0.15 μs (v′ = 3), 2.56±0.15 μs (v′ = 4), and 2.38±0.16 (v′ = 5). For the B 2Σ+ state measurements, no pressure dependence over a range 1–40 mTorr has been observed; the lifetimes are found to be 53.8±0.8 ns (v′ = 0), 58.1±0.8 ns (v′ = 1), and 63.3±1.0 ns (v′ = 2).

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