Physics – Chemical Physics
Scientific paper
2007-12-07
Physical Review A 77, 012723 (2008).
Physics
Chemical Physics
Phys. Rev. A, in press
Scientific paper
10.1103/PhysRevA.77.012723
The spin-exchange effect in spin-polarized electron collisions with unpolarized open-shell molecules, O$_2$, B$_2$, S$_2$ and Si$_2$, has been studied by the R-matrix method with the fixed-bond approximation. All of these molecules have ${}^3 \Sigma_{g}^{-}$ 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 O$_2$ elastic collisions, calculated polarization fractions agree well with the experimental results, especially around the ${}^4 \Sigma_u^-$ resonance. In e-B$_2$, S$_2$ and Si$_2$ elastic collisions, larger spin-exchange effect is observed compared to the e-O$_2$ 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-B$_2$ collisions than in e-S$_2$ and Si$_2$ collisions, and is smallest in e-O$_2$ collisions.
No associations
LandOfFree
Exchange effects in elastic collisions of spin-polarized electrons with open-shell molecules with $^3Σ_g^-$ symmetry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Exchange effects in elastic collisions of spin-polarized electrons with open-shell molecules with $^3Σ_g^-$ symmetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exchange effects in elastic collisions of spin-polarized electrons with open-shell molecules with $^3Σ_g^-$ symmetry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-120135