Vibrational populations of the excited states of N2 under auroral conditions

Details Vibrational populations of the excited states of N2 under auroral conditions Vibrational populations of the excited states of N2 under auroral conditions

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..517c&link_type=abstract

Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 517-531. ERDA-supported research;

Physics

50

Atmospheric Chemistry, Auroral Spectroscopy, Molecular Energy Levels, Molecular Excitation, Nitrogen, Vibrational Spectra, Diatomic Gases, Electron Impact, Electron Spectroscopy, Transition Probabilities

Scientific paper

Detailed vibrational populations have been determined for all singlet and triplet excited states of N2 within 12.5 eV of the ground state excited under normal auroral conditions. This was done by solving the equations of statistical equilibrium for the population and depopulation of the electronic states, and by using measurements of auroral secondary electron spectra for calculating rates for electron impact excitation. The results of the calculations yield absolute vibrational populations for all electronic states. For lower singlet and triplet states, intrasystem cascading and vibrationally dependent quenching were found to be significant factors in identifying vibrational populations. Future work will concern absolute intensities expected in the band systems emitted by the excited states and will compare them to auroral measurements. Populations and emissions from high-lying singlet states will also be investigated.

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