Comparison of the electron impact cross section for the <formula>N2+ first negative (0,0) band (λ3914 Å) measured by optical fluorescence, coincidence electron impact, and photoionization experiments

Details Comparison of the electron impact cross section for the <formula>N2+ first negative (0,0) band (λ3914 Å) measured by optical fluorescence, coincidence electron impact, and photoionization experiments Comparison of the electron impact cross section for the <formula>N2+ first negative (0,0) band (λ3914 Å) measured by optical fluorescence, coincidence electron impact, and photoionization experiments

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10119723d&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A9, p. 19723-19728

Physics

11

Ionosphere: Electric Fields, Magnetospheric Physics: Electric Fields

Scientific paper

The cross-section for production of the N2+ B2Σu+ state by electron impact on N2 is one of the most important cross-sections for aeronomy because of the prominence of the N2+ first negative (0,0) band (B2Σu+<-X2Σg+,λ3914 Å) in the dayglow and aurora. Recently developed electron-electron coincidence experiments have made possible the measurement of the branching ratios for ionization-excitation of N2 by electron impact at the 100-eV maximum of the cross-section. The N2 total ionization cross-section, measured in other experiments, can then be used to calculate the cross-section for production of the N2+ B2Σu+ state at 100-eV. Photoionization partial cross-sections and branching ratios from high-energy electron impact experiments are used to calculate the N2+ B2Σu+ cross-section at 2000-eV. The 100- and 2000-eV results are compared with cross-sections from electron impact optical emission experiments at the same incident energies. The cross-sections from electron impact and photoionization experiments are 30% smaller than the optical emission cross-section of Borst and Zipf at both 100-eV and 2000-eV incident energies but within 20% of the results of the most recent optical measurement at 100-eV. A value of 14.8×10-18 cm2 for the N2+ B2Σu+ first negative (0,0) band cross-section maximum at 100-eV is within the error bars for all the experimental measurements except one.

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