Differential cross sections for vibrational excitation of CO2 by 1.5-30 eV electrons

A crossed-beam experiment has been performed to measure differential vibrationally inelastic cross sections for electron scattering from CO2 in the energy range from 1.5 to 30 eV over the scattering angles of 10-130 degrees. Near the (2)Pi (u) resonance at 3.8 eV, the angular and energy dependences of the differential cross sections (DCS) have been determined in detail. Absolute values are obtained by normalizing the inelastic cross sections to the elastic ones. To determine the intensity of the individual vibrational modes from the energy-loss spectra, a deconvolution procedure was employed. The DCS for the pure fundamental modes (010), (100), (001) and the overtone of (020) are reported in detail for the first time over wide ranges of impact energy and scattering angle.