RESONANT ELASTIC-SCATTERING AND ELECTRON-CAPTURE BY AL-LIKE P2+ AND S3+ IONS AT LOW ENERGIES

Resonant electron capture and elastic scattering cross sections and rate coefficients of the ground state (3s2 3p)2P of Al-like P2+ and S3+ are calculated at low energies (e(c) < 0.65 Ry). Explicit calculation of Auger and radiative transition probabilities are evaluated at low n (n < 11), and extrapolated to high n-values. These probabilities were calculated using single configuration non-relativistic Hartree-Fock wavefunctions in LS coupling. We averaged the cross sections over an energy bin of width DELTAe(c) = 0.01 Ry. The resonance elastic scattering cross sections are 4 to 6 orders of magnitude larger than the capture cross sections, mainly because of the smallness of the fluorescence yields of the resonance levels. The resonance elastic scattering cross sections are found to decrease with increasing the atomic number in a given isoelectronic sequence.