Other
Scientific paper
Oct 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970phrva...2.1331c&link_type=abstract
Physical Review A, vol. 2, Issue 4, pp. 1331-1348
Other
50
Scientific paper
A consistent set of total cross sections for electron impact excitation of the A3Σ+u, B3Πg, W3Δu, B'3Σ-u, C3Πu, E3Σ+g, and D3Σ+u triplet states of molecular nitrogen from the X1Σ+g state has been calculated quantum mechanically for incident electron energies from threshold to 80 eV. The Ochkur-Rudge exchange scattering and Franck-Condon approximations were employed to obtain these cross sections. Minimum and double-minimum basis-set LCAO-MO wave functions centered on the nuclei were used, and the multicenter terms in the scattering amplitude were evaluated using a ζ-function expansion. Rotationally averaged cross sections were calculated for excitation from v''=0 to individual v' levels of the excited electronic states. The calculated total cross section for excitation of the B3Πg state is in good agreement with that deduced from recent experimental data for the process. The cross section for excitation of the C3Πu state agrees well with one pair of experimental measurements and is a factor of 2 larger than another pair of measurements and about a factor of 4 larger than a fifth experimental determination and the previous calculations. The calculated cross section for excitation of the A3Σ+u state is a good deal larger than previous theoretical and experimental estimates. However, a comparison with recent experimental differential cross-section data indicates that the theoretical A3Σ+u total cross section is correct for incident energies greater than about 35 eV. The relative magnitude of these excitation cross sections leads to interesting predictions concerning N2 processes in the upper atmosphere.
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