Electron-impact study of SOS using theR-matrix method

Abstract

We have carried out a comprehensive study of electron impact on open SOS isomer by using the $R$-matrix method. Elastic (integrated and differential), momentum-transfer, excitation, and ionization cross sections along with efffective collision frequency over a wide electron temperature range (100--30 000 K) have been presented. The target states are represented by including correlations via a configuration interaction technique. The results of the static-exchange, correlated one-state, and 31-state close-coupling approximation are presented. Our study has detected a shape resonance, five core-excited shape resonances, and two Feshbach resonances in the 31-state model. We detect a stable bound state of SOS${}^{\ensuremath{-}}$ having configuration $1{a}_{1}^{2}2{a}_{1}^{2}\dots{}9{a}_{1}^{2},1{b}_{1}^{2}2{b}_{1}^{2}3{b}_{1},1{b}_{2}^{2}2{b}_{2}^{2}\dots{}7{b}_{2}^{2},1{a}_{2}^{2}2{a}_{2}^{2}$ with a vertical electronic affinity value of 1.999 eV. The ionization cross sections are calculated in the binary-encounter Bethe model in which Hartree-Fock molecular orbitals at self-consistent level are used to calculate kinetic and binding energies of the occupied molecular orbitals.