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Quantal calculation of the lifetime of N+(5S) and the λ2145A? auroral mystery feature
Authors:A Hibbert  DR Bates
Institution:Department of Applied Mathematics and Theoretical Physics, Queen''s University, Belfast BT7 INN, Northern Ireland
Abstract:The calculated radiative lifetime of the metastable ion is 6.4 × 10?3s. Used in conjunction with the results of measurements by Erdman, Espy and Zipf this sets 1.3 × 10?18 cm2 as the upper limit to the cross section for the formation of N+(5S) in e - N2 collisions at 100eV which leaves the possibility that the process is responsible for the λ2145A? feature in auroras only just open. The cross section for the formation of N+(5S) in e — N collisions is large. However for this process to lead to the observed intensity of λ2145A? relative to λ3914A? the N:N2 abundance ratio would have to be as high as 1.6 × 10?2.
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