Abstract
The A 2Π–X 2Σ +Δ v = −3 bands of the 12C 14N radical have been observed by time-resolved Fourier transform spectroscopy in the 1850–3100 cm −1 region with a wavenumber resolution of 0.025 cm −1. The radical was produced in a pulsed positive column discharge in a cyanogene and helium mixture. Seven bands of v = 0–3, 1–4, 2–5, 3–6, 4–7, 5–8, and 6–9 were analyzed to give the molecular constants of each state by least-squares fitting of 801 lines. The pulsed discharge was found to be efficient for production of CN in the excited A 2Π state. The vibrational excitation temperature was determined to be 6680 ± 835 K and 6757 ± 534 K for the A 2Π and X 2Σ + states, respectively. The population of the A 2Π was found to be 4% of that of the X 2Σ + state in the time after turning off the discharge.
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