Doubly Differential Electron-Production Cross Sections for 200- 1500-eV e\u3csup\u3e-\u3c/sup\u3e +H\u3csub\u3e2\u3c/sub\u3e Collisions

Ionization cross sections differential in the angle and energy of the detected electrons were measured for electron impact on hydrogen gas at 200, 500, 1000, and 1500 eV. Measurements were made from 15°-150° and from a few eV to T -I where T is the primary electron energy and I the ionization potential of hydrogen. The results are compared to earlier measurements and to available calculations