A comparative study of electron-impact cross sections of C4F6 isomers from 15 to 5000 eV

Abstract

Electron-impact differential, integral, and momentum transfer cross sections (CS) are computed for C4F6 isomers from 15 to 5000 eV by employing the Single Center Expansion formalism. The molecular wavefunctions of isomers are obtained using the multicenter expansion of Gaussian-type orbitals within the single determinant Hartree-Fock self-consistent field scheme. The electron-molecule interaction is modeled by summing the static, exchange, and correlation-polarization types of potentials. The exchange and correlation-polarization potentials account for the indistinguishability of incident electron and target electrons and the distortion of charge density of target by the impinging electron, respectively. The multipole expansion of the target at center of mass includes the dipole and higher order terms. The local description of potential permits us to rewrite the scattering radial equations in a simplified form. The electron impact ionization CS are obtained using the Binary-Encounter-Bethe model. The elastic and inelastic CS are summed incoherently to obtain total CS over a wide energy range. A good agreement is observed with the available data for different types of CS obtained.