Distorted-wave calculation of electron-impact excitation of atomic oxygen

A distorted-wave formulation with exchange is given for the electron-impact excitation of atoms from ${\left(n_0{l}_0\right)}^N$ to ${\left(n_0{l}_0\right)}^{N-1}nl$ configurations using the LS-coupling scheme. Phenomenologically determined independent-particle models and distorted-wave potentials are utilized to compute angular distributions and integrated cross sections for 2p→3s,3p, and $4p$ excitations of atomic oxygen over wide ranges of energy and momentum transfer. The results are compared with the Born-approximation limit as well as the experimental integrated cross section of Stone and Zipf.