Dissociative excitation of the N(+)(5S) state by electron impact on N2 - Excitation function and quenching

Details Dissociative excitation of the N(+)(5S) state by electron impact on N2 - Excitation function and quenching Dissociative excitation of the N(+)(5S) state by electron impact on N2 - Excitation function and quenching

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9111345e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 11345-11351.

Physics

Atomic Physics

7

Auroral Spectroscopy, Electron Impact, Molecular Excitation, Nitrogen, Ultraviolet Radiation, Dissociation, E Region, Electron Energy, Emission Spectra, Photomultiplier Tubes, Quenching (Atomic Physics)

Scientific paper

Metastable N(+)(5S) ions were produced in the laboratory by dissociative excitation of N2 with energetic electrons. The resulting radiative decay of the N(+)(5S) state was observed with sufficient resolution to completely resolve the doublet from the nearby N2 molecular radiation. The excitation function was measured from threshold to 500 eV. The cross section peaks at a high electron energy and also exhibits a high threshold energy both of which are typical of dissociative excitation-ionization processes. This finding complicates the explanation of electron impact on N2 as the mechanism for the source of the 2145 A 'auroral mystery feature' by further increasing the required peak cross section. It is suggested that the apparent N(+)(5S) quenching in auroras may be an artifact due to the softening of the electron energy spectrum in the auroral E region.

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