Absolute differential and integral electron excitation cross sections for atomic nitrogen. II - The 4S0 - 2p4 4P(1135 A) transition from 30 to 100 eV

Details Absolute differential and integral electron excitation cross sections for atomic nitrogen. II - The 4S0 - 2p4 4P(1135 A) transition from 30 to 100 eV Absolute differential and integral electron excitation cross sections for atomic nitrogen. II - The 4S0 - 2p4 4P(1135 A) transition from 30 to 100 eV

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.4295d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 4295-4298.

Physics

9

Atomic Excitations, Earth Atmosphere, Electron Energy, Ionization Cross Sections, Nitrogen Atoms, Energy Dissipation, Energy Spectra, Fluorescence, Scattering Cross Sections

Scientific paper

Attention is given to the absolute direct differential and integral electron excitation cross sections for the atomic nitrogen 4S0 - 2p4 4P(1135 A) transition measured at incident energies of 35, 50, and 100 eV. The differential cross sections measured versus scattering angle were integrated to give the integral cross section as a function (ICS) of incident energy. The ICS has a maximum value of 0.43 x 10 exp -16 sq cm (+/-30 percent) near 50 eV. It is shown that as for the 1200-A N I transition cross section, there is a strong cascade contribution to the fluorescence cross section from forbidden transition to higher states excited by low-energy electron impact near threshold. Above 50 eV, there is only a small cascade contribution. The optical oscillator strength of the N I (1135 A) multiplet obtained from the present data is 0.1 +/-0.005.

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