Low Energy Elastic Electron Scattering from Dimethyl Ether and Diethyl Ether*

Experimental differential cross sections for electron scattering from two ethers - gaseous (CH$_{\mathrm{3}})_{\mathrm{2}}$O and (C$_{\mathrm{2}}$H$_{\mathrm{5}})_{\mathrm{2}}$O - are presented. The measurements are taken with a high resolution electron spectrometer and use the relative flow method with a moveable (aperture) target gas delivery source [1] which obviates the need to know gas kinetic cross sections for the target molecule. Helium gas was used as standard, with established cross sections from [2,3]. The moveable source enables accurate determinations of background scattering [1] and the measurements are taken at incident electron energies of 1 eV to 30 eV for scattering angles of 10$^{\mathrm{o}}$ to 130$^{\mathrm{o}}$. Comparisons with existing cross sections are made. [1] M. A. Khakoo \textit{et al}., J. Phys.B. \textbf{40}, 3601 (2007). [2] R. K. Nesbet, Phys. Rev. A \textbf{20}, 58 (1979). [3] D. F. Register et al. Phys. Rev. A \textbf{21}, 1134 (1980).