Generalized oscillator strengths for SF6 in the S 2p inner-shell region Original Research Article

The extrapolation to the optical oscillator strengths (OOSs) of the recently measured small-angle, θ ⩽ 10° generalized oscillator strengths (GOSs) for SF6 in the S 2p inner-shell region at 1400 eV impact energy has been investigated using various theoretical approaches. These methods include the recent momentum dispersion formula which has the more reliable larger scattering angle measurements embedded in it, the universal formula and the Lassettre fitting formula. From the comparison between the measurements and the universal formula, it is concluded that dynamic effects are less significant for the T1u(a1g) state for θ ⩽ 8°, but are important for the T1u(t2g) and T1u(eg) states. We further conclude that the extrapolated OOSs depend sensitively upon the method of extrapolation. The momentum dispersion method produces extrapolated OOS values that are consistent with those of the experiment, thereby manifesting the importance of the accuracy of the larger scattering angle measurements in the extrapolation.