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Resonant excitation of NH3 by low energy electron impact: the nu 1,3 normal vibrational modes

The authors report measurements of absolute differential cross sections for the electron impact excitation of the nu 1,3 vibrational modes of NH3 at incident energies of 5, 7.5 and 15 eV. Previous experiments have demonstrated the influence of a broad shape resonance (E symmetry) on the vibrational excitation cross section but have differed significantly as to the position and width of this feature. Consequently, the authors have also measured the energy dependence of the nu 1,3 excitation cross section in the energy range 5-10 eV at a scattering angle of 90'. This revealed a resonance centred at about 7.3 eV with a width of approximately 3.5 eV, the latter being in good agreement with the measurement of Cvejanovic et al. The present differential cross section at 7.5 eV also confirms the dominant l=2 character of the resonant partial wave.