SINGLE-ELECTRON AND DOUBLE-ELECTRON LOSS OF H- IN COLLISIONS WITH SF6, CH4, AND CO

Measurement of absolute, total cross sections for single- and double-e lectron detachment of H- projectiles in sulfur hexafluoride, methane, and carbon oxide has been made. The relative energy range under invest igation was from 1 to 5 keV. The resulting cross sections for the sing le-electron loss of H- in SF6 exhibit a flat behavior, whereas for met hane and carbon monoxide the single detachment cross section increases with the energy. A free-collision model for electron loss was applied , and very good agreement was found for SF6, while for the other targe ts there is a departure of the trend of the experimental data. A compa rison with the results from other research laboratories is given. The measured double-electron detachment cross sections are roughly one ord er of magnitude smaller than the single detachment cross sections.