Electron-CF4elastic scattering in the static-exchange approximation

We report differential, integral, and momentum-transfer cross sections for the elastic scattering of electrons by ${\mathrm{CF}}_4$ from 5 to 35 eV. The calculations were carried out at the fixed-nuclei, static-exchange level using the Schwinger variational principle. Analyses of the partial channel amplitudes show four broad shape resonances; two in $T_2$, one in $A_1$, and one in E symmetries. The positions of these resonances agree with experimental data from total-cross-section measurements, dissociative attachment studies, and low-energy electron excitation spectra, the only exception being the 8.9-eV structure in the total-cross-section data. No experimental measurements on differential cross sections are available, but comparing with the corresponding static-exchange calculations for the e-${\mathrm{CH}}_4$ system, the e-${\mathrm{CF}}_4$ cross sections generally are less backward peaked.