Abstract
Lifetimes of a number of the red and violet CN bands have been studied at high spectral resolution using the High Frequency Deflection technique. While the result for the violet bands essentially supports earlier results, it is found that the lifetimes as well as the intensities of the red bands are strongly perturbed by processes which are suggested to be collisional transfers from X levels to near-lying A levels. These effects remain if additional catalyser gases are added to the ordinary C2N2 gas target and the increase of the A-X lifetimes and band-intensities depends on the polarizibility of the added gases. Simple models are presented for the time-resolved case as well as the steady state case from which the coefficient for the transfer rate is found to be of the order 10-10-10-11 cm3/s, mol. The new oscillator strengths for the red system corrected for the transfer effects are notably higher than earlier estimates and the astrophysical consequences of this are briefly discussed.
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