Total Electron Scattering Cross Sections in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and Ne

A modified Ramsauer technique has been used to measure the total low-energy scattering cross sections of electrons in ${\mathrm{O}}_{2}$ over an energy range from 2.35 to 21 eV, and in Ne over a range from 0.37 to 20 eV. A broad clearly defined "bump" is observed in the $e\ensuremath{-}{\mathrm{O}}_{2}$ cross section with the maximum occurring between 11 and 12 eV. Both the ${\mathrm{O}}_{2}$ and Ne cross-section data are in good agreement with Br\"uche's measurements at energies above 2 eV. Extrapolation of the low-energy Ne data to zero energy, using modified effective-range theory, yields a zero-energy scattering length of $(0.30\ifmmode\pm\else\textpm\fi{}0.03){a}_{0}$, where ${a}_{0}$ is the Bohr radius.