Absolute Differential Cross Sections of Elastically Scattered Electrons. II. A Polarization Scattering Potential for Hg at 500, 400, and 300 eV

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Absolute differential cross sections of electrons elastically scattered by Hg have been measured at 500, 400, and 300 eV. We find that over this energy range, for angles between 2.5° and 20°, the measured cross sections can be accurately described using the Born approximation with a long-range effective potential of the form V(r) = 4Cb / π(r2 + b2)2, where C and b are constants arising from the intercept and slope, respectively, of plots of lnσ vs ΔP, and where 4Cb / π = α / 2, where α is the polarizability of the Hg atom.