Study of Angular Momentum Transfer in Electron-Impact \text{2s}\to\text{2p} Excitation for Lithium Isoelectronic Sequence

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For the electron-impact \text{2s{\space}^{2}S^{\text{e}}}\to\text{2p{\space}^{2}P^{\text{o}}} excitation of the lithium isoelectronic sequence with nuclear charge Z=3{\mbox{--}}6, distorted-wave (DW) and close-coupling (CC) calculations are applied to investigate the angular momentum transfer (AMT) as a function of scattering angle. The integral cross section and angular distribution of scattered electrons are also calculated. For the ion targets, the AMT is approximately described by the DW calculation where the static-exchange potential is considered as a distorting potential. For the Li atom, a calculation beyond the two-state CC calculation of 2s and 2p is required at low incident energies. For higher incident energies (\gtrsim 7 eV), the electron-exchange effect becomes less important for small-angle scattering. For energies above 20 eV, the excitation process is approximately described by the DW calculation where the distorting potential is the static potential.
2011-03-15