Exchange effects in elastic collisions of spin-polarized electrons with open-shell molecules with 3g- symmetry
Abstract
The spin-exchange effect in spin-polarized electron collisions with unpolarized open-shell molecules, O2, B2, S2 and Si2, has been studied by the R-matrix method with the fixed-bond approximation. All of these molecules have 3 g- symmetry in their ground states. Usual integrated cross sections with unpolarized electrons has also been studied. We used the complete active space self consistent field orbitals and put more than 10 target electronic states in the R-matrix models. In electron O2 elastic collisions, calculated polarization fractions agree well with the experimental results, especially around the 4 u- resonance. In e-B2, S2 and Si2 elastic collisions, larger spin-exchange effect is observed compared to the e-O2 elastic collisions. In all four cases, spin-exchange effect becomes prominent near resonances. This association of resonance and magnitude of the spin-exchange effect was studied by explicitly removing the resonance configurations from the R-matrix calculations. In general, spin-exchange effect is larger in e-B2 collisions than in e-S2 and Si2 collisions, and is smallest in e-O2 collisions.
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