3 research outputs found
A comprehensive and comparative study of elastic electron scattering from OCS and CS2 in the energy region from 1.2 to 200 eV
We report absolute differential cross sections (DCSs) for elastic electron scattering from OCS (carbonyl
sulphide) and CS2 (carbon disulphide) in the impact energy range of 1.2–200 eV and for
scattering angles from 10â—¦ to 150â—¦. Above 10 eV, the angular distributions are found to agree quite
well with our present calculations using two semi-phenomenological theoretical approaches. One
employs the independent-atom model with the screening-corrected additivity rule (IAM-SCAR),
while the other uses the continuum-multiple-scattering method in conjunction with a parameter-free
exchange-polarization approximation. Since OCS is a polar molecule, further dipole-induced
rotational excitation cross sections have been calculated in the framework of the first Born approximation
and incoherently added to the IAM-SCAR results. In comparison with the calculated DCS
for the S atom, atomic-like behavior for the angular distributions in both the OCS and CS2 scattering
systems is observed. Integrated elastic cross sections are obtained by extrapolating the experimental
measurements, with the aid of the theoretical calculations, for those scattering angles below 10â—¦ and
above 150â—¦. These values are then compared with the available total cross sections