A detailed study is presented of the electronic excitation of a nitrogen beam accelerated by a Van de Graaff machine to energies between 0.25 and 2.0 MeV/atom, and passed through a thin carbon target foil. About 100 spectral lines of N ii through N v were detected. In addition, a number of unidentified lines were seen and their wavelengths measured. Decay times of 27 levels in N ii through N v were measured and correlated with calculated transition probabilities.
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Fink et al. (1968) studied this question.