Geometry dependence of resonance background separation within the R-matrix approach in the e-+CF3Cl system

Elastic electron scattering off CF3Cl is studied for different nuclear geometries by separating the resonant processes from the scattering background. This separation is performed within the Feshbach projection operator formalism, applied to R-matrix theory. In the energy region below 13 eV two resonances of (2)A(1) symmetry and one of E-2 symmetry are found. In background scattering the target appears as nearly spherical and the effect of the C-Cl distance is very small over a range of 0.8 Bohr. This means that in the present example the molecular structure as it appears in low-energy electronically elastic electron scattering is entirely provided by resonant processes.