Linda Uhlmann

Elastic electron scattering from C6H6 and C6F6

We present absolute measurements of differential elastic electron scattering cross sections from benzene (C6H6) and hexafluorobenzene (C6F6). The measurements have been performed in our two laboratories on different crossed-beam apparatuses for scattering angles between 10° and 130°: C6H6 at the Australian National University in the energy range from 1.1 to 40 eV, and C6F6 at Sophia University from 1.5 to 100 eV. The cross sections for both molecules, which are characterized by strong forward-angle scattering and large-angle oscillations, are favourably compared with recent theoretical calculations.

Elastic electron scattering from sulfur hexafluoride

Absolute differential cross sections for elastic scattering of electrons from sulfur hexafluoride (SF6) have been measured at 11 incident energies between 2.7 and 75 eV and for scattering angles between 10° and 130°. The magnetic angle-changing device of Read and co-workers has been used to extend these measurements to backward angles (130°-180°) for incident energies below 15 eV. The measurements reveal some substantial differences with several previous determinations and a reasonably good level of agreement with a recent close-coupling calculation.