Cross sections for electron scattering by ground state Ba: elastic scattering and excitation of the ... 6s6p 1P1 level

Differential cross sections for elastic and inelastic (6s6p 1P1) electron scattering from ground state Ba atom have been measured at 5 eV, 10 eV, 15 eV and 20 eV impact energies in the angular range from 0o to 130o. Extrapolation to larger angles has been performed using theoretical calculations as a guide, and integral and momentum transfer cross sections were derived. Theoretical calculations based on two-channel close coupling and relativistic and non-relativistic distorted wave methods have been compared with the present results. Good agreement between experiment and various theoretical results is found at small scattering angles but significant deviations exist at larger scattering angles. (Author)