Angular distribution measurements for spin-orbit-state-resolved S 2 p photoelectrons of SF 6 in the shape-resonance region

The angular distributions of the spin-orbit state resolved S $2p$ photoelectrons of ${\mathrm{SF}}_{6}$ have been measured in the vicinity of the shape resonances. Relative partial photoionization cross sections of ${\mathrm{SF}}_{6}$ into the (S ${2p}_{3/2}{)}^{\ensuremath{-}1}$ and (S ${2p}_{1/2}{)}^{\ensuremath{-}1}$ states, and the asymmetry parameters of the S ${2p}_{3/2}$ and S ${2p}_{1/2}$ photoelectrons are presented. Enhancement of the photoionization cross section into the (S ${2p}_{3/2}{)}^{\ensuremath{-}1}$ state at the (S ${2p}_{1/2}{)}^{\ensuremath{-}1}$ ${2t}_{2g}$ resonance has been observed. The excitation photon energy dependence of the asymmetry parameter shows a broad dip at about the photon energies of the resonances. Continuum multiple-scattering calculation of the asymmetry parameters for the (S ${2p}_{3/2}{)}^{\ensuremath{-}1}$ and (S ${2p}_{1/2}{)}^{\ensuremath{-}1}$ states of ${\mathrm{SF}}_{6}$ reproduces this behavior.