On the dissociation of nitrogen by electron impact and by EUV photo-absorption

Details On the dissociation of nitrogen by electron impact and by EUV photo-absorption On the dissociation of nitrogen by electron impact and by EUV photo-absorption

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..449z&link_type=abstract

Planetary and Space Science, vol. 26, May 1978, p. 449-462.

Economy

75

Auroras, Electron Impact, Far Ultraviolet Radiation, Gas Dissociation, Nitrogen, Photoabsorption, Dayglow, Emission Spectra, Energy Budgets, Molecular Energy Levels, Molecular Excitation, Photodissociation, Scattering Cross Sections

Scientific paper

The dissociation of N2 by electron impact and by absorption of EUV photons was studied experimentally. It was shown that most of the N2 molecules excited to singlet states in the 12.5-14.86 eV range are depopulated by predissociation and not by the emission of EUV photons and that this is the principal mechanism by which N2 is dissociated by solar EUV absorption and by electron impact. The experiments provide a physical explanation for the near absence of N2 band radiation in airglow and auroral EUV spectra, and rule out the excitation of EUV radiation as a major factor in the overall energy economy of an auroral substorm.

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