Fast nitrogen atoms from dissociative excitation of N2 by electron impact

Details Fast nitrogen atoms from dissociative excitation of N2 by electron impact Fast nitrogen atoms from dissociative excitation of N2 by electron impact

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10118953a&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue E8, p. 18953-18960

Physics

13

Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Particle Precipitation, Ionosphere: Planetary Ionospheres

Scientific paper

The Doppler profiles of one of the fine structure lines of the NI (1200 Å) g4S0-4P multiplet and of the NII (1085 Å) g3P0-3D multiplet have been measured. Excitation of the multiplets is produced by electron impact dissociative excitation of N2. The experimental line profiles are evaluated by fast Fourier transform (FFT) techniques and analysis of the profiles yields the kinetic energy distribution of fragments. The full width at half maximum (FWHM) of NI (1200 Å) increases from 27+/-6 mÅ at 30 eV to 37+/-4 mÅ at 100 eV as the emission cross section of the dissociative ionization excitation process becomes more important relative to the dissociative excitation process. The FWHM of the NII (1085 Å) line is 36+/-4 mÅ at 100 eV. For each multiplet the kinetic energy distribution function of each of the two fragment N atoms (ions) is much broader than thermal with a mean energy above 1.0 eV. The dissociation process with the largest cross section is predissociation and predominantly produces N atoms with kinetic energy distributions having mean energies above 0.5 eV. Dissociative processes can lead to a substantial escape flux of NI atoms from the satellites, Titan and Triton of the outer planets.

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