Direct experimental measurement of electron impact ionization-excitation branching ratios. I - Results for N2 at 100 eV

Details Direct experimental measurement of electron impact ionization-excitation branching ratios. I - Results for N2 at 100 eV Direct experimental measurement of electron impact ionization-excitation branching ratios. I - Results for N2 at 100 eV

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9616025d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 16,025-16,030.

Other

13

Electron Impact, Ionization, Molecular Energy Levels, Nitrogen, Atmospheric Composition, Electron Energy, Electron Scattering

Scientific paper

This paper presents a novel laboratory experiment to measure electron impact ionization-excitation branching ratios for the formation of positive ions of atmospheric species in the ground and excited electronic states of the ion. The distribution of N2(+) ions produced in the X 2Sigma-g(+), A 2Pi-u, and B 2Sigma-u(+) electronic states by 100-eV electron impact ionization of N2 is measured directly. The final ion state is determined from the energy of the ejected electron and the energy lost by the incident electron. Spectra of coincidence rate versus primary electron energy loss are obtained at fixed ejected secondary electron energies of 2.5, 5.0, 10.0, and 15.0 eV. Peaks in these spectra are observed corresponding to the three final states of the N2(+) ion. The relative peak areas are proportional to the partial branching ratios at each secondary electron energy. Branching ratios at 100 eV integrated over angle and energy variables are computed from the data. They are in excellent agreement with the branching ratios obtained by other techniques.

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