Quantal calculation of the lifetime of N+(5S) and the λ2145Å auroral mystery feature

Details Quantal calculation of the lifetime of N+(5S) and the λ2145Å auroral mystery feature Quantal calculation of the lifetime of N+(5S) and the λ2145Å auroral mystery feature

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..263h&link_type=abstract

Planetary and Space Science, Volume 29, Issue 2, p. 263-268.

Physics

35

Scientific paper

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 λ2145Å 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 λ2145Å relative to λ3914Å the N:N2 abundance ratio would have to be as high as 1.6 × 10-2.

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