ELASTIC COLLISIONS OF LOW-ENERGY TO INTERMEDIATE-ENERGY ELECTRONS FROM CARBON-DIOXIDE - EXPERIMENTAL AND THEORETICAL DIFFERENTIAL CROSS-SECTIONS

Absolute elastic differential cross sections for electron collision wi th carbon dioxide (CO2) at impact energies from 1.5 to 100 eV and scat tering angles from 15 degrees to 130 degrees have been measured. Also, a calculation has been made that uses two different types of close-co upling approaches and covers all scattering angles in the same energy region. The measurements are in excellent agreement with observations by other authors. They also agree with the present calculation for all energies above 10 eV. The agreement becomes less satisfactory as the energy decreases below 8 eV, particularly at scattering angles below 6 0 degrees, where the measurements show a conspicuous shoulder around t his angle in the energy between 5 and 7 eV. Integral and momentum-tran sfer cross sections have been estimated from extrapolations to 0 degre es and 180 degrees. Extensive comparisons with recent other theories a re included.