Abstract
In a crossed-beam experiment, vibrational excitation (VE) of ethane by electron impacthas been measured for collision energies in the range E = 1– 10 eV.The energy resolution is 30 meV (FWHM) in the energy-loss mode.The observed VE processes are divided into three groups: (i) CHstretching modes with a mean energy loss of ΔE = 365 meV; (ii)CH3deformation modes with ΔE = 180 meV;(iii) CC carbon chain vibrations with ΔE = 125 meV.Absolute differential and integral cross sections are determined for thethree groups of vibrations. The results are interpreted by two principalVE mechanisms: direct excitation for energies below 3 eV and resonantexcitation for energies around 7–8 eV. At low energies (E < 3 eV) thepresent results are compared with the results from swarm experiments, while for E ≥ 3 eVthe present measurements resolve some discrepancies between the results oftwo previous beam experiments. The present work complements aprevious study by the same authors on elastic e–C2H6scattering in this energy range.
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