Excitation by Electron Impact of Vibrational Transitions in Water and Carbon Dioxide at Kinetic Energies between 30 and 60 eV

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Abstract
Vibrational excitation by electron impact, in the kinetic-energy range 30–60 eV, has been studied for water vapor and carbon dioxide. Intensities relative to elastic scattering have been determined at scattering angles to 15°. Fundamental vibrations are excited with much greater intensity than either overtones or combination bands, although the latter appear (weakly) in the spectra. Weak scattering in the energy-loss region 4.5–7.0 eV and its interpretation is discussed.