Origin of enhanced vibrational excitation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>by electron impact in the 15-35 eV region

The authors calculate the integrated vibrational excitation cross section for $e$-${\mathrm{N}}_{2}$ scattering in the interval 0-50 eV using the continuum multiple-scattering model with the Hara exchange approximation. Resonant enhancement is observed at 2.4 eV owing to the well-known ${\ensuremath{\pi}}_{g}$ shape resonance. In addition, however, enhanced vibrational excitation is found centered at \ensuremath{\sim}26 eV, arising from a broad shape resonance in the ${\ensuremath{\sigma}}_{u}$ channel. The authors propose this one-electron feature as the main source of the enhanced vibrational excitation observed by Pavlovic et al. in the 15-35 eV region.

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