Quantal calculation of the lifetime of N+(5S) and the λ2145A? auroral mystery feature期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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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 $N^{+} (^{5} S)$ in e - N₂ collisions at 100eV which leaves the possibility that the process is responsible for the $λ2145 A ?$ feature in auroras only just open. The cross section for the formation of $N^{+} (^{5} S)$ in e — N collisions is large. However for this process to lead to the observed intensity of $λ2145 A ?$ relative to $λ3914 A ?$ the N:N₂ abundance ratio would have to be as high as 1.6 × 10^?2.

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