Metastable nitrogen ions are observed to radiate in the wavelength range 1700–3200 Å. Two lifetimes, 4.4−1.4+2.0 and 44 ± 11 μsec, have been measured. The electron energy dependence of the excited radiation is similar to the energy dependence previously observed for the production of N3+ when N2 is bombarded by electrons.
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Maier et al. (1970) studied this question.
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