Electron impact ionization of Methane at intermediate energy*

We have investigated the triple differential cross sections (TDCSs) for the electron impact ionization of the 1t$_{\mathrm{1}}$ state of molecular CH$_{\mathrm{4}}$ at 250 eV for asymmetric coplanar geometry with the scattering angles of 10$^{\mathrm{o}}$, 20$^{\mathrm{o}}$, and 25$^{\mathrm{o}}$ at fixed ejected energies 30 eV and 50 eV. The experimental measurement are compared to molecular 3-boday distorted wave (M3DW), where the theory used two different calculations by using proper average (M3DW-PA) and orientation averaged molecular orbital (M3DW-OAMO) approximation. The theory predicts the shape and the structure of cross section for experiment. Overall, the M3DW-PA show better shape agreement with experiment more than OAMO calculations.