Electron scattering by polar molecules using the R-matrix method

Ab initio results for e-LiH and e-CO Scattering are reported using a new numerical continuum basis in the R-matrix method. In the case of e-LiH scattering, converged 2 Sigma eigenphase sums are obtained in the static exchange approximation. In the case of e-CO scattering, converged eigenphase sums and momentum transfer cross sections are obtained at a low and intermediate energies including electron exchange and nonadiabatic polarisation effects. The low-energy e-CO 2 pi shape-resonance parameters are calculated as a function of internuclear separation for the first time, and are found to be in excellent agreement with experiment. Evidence is also presented for the e-CO 2 Sigma shape resonance at about 20 eV. The momentum transfer cross section is in good agreement with experiment.