Electron elastic scattering resonances in the collision of fast hydrogenicions with molecular hydrogen

Absolute double differential cross sections for the electron production at zero degree laboratory observation angle were measured for high velocity hy drogenic carbon, nitrogen, oxygen and fluorine ions on molecular hydrogen. The energies of these ions were chosen so the elastic scattering resonance 2p(2) D-1 for each case can be clearly observed near the peak of the binary encounter electron distribution. Close coupling R-matrix calculations of e lastic differential cross sections of electron impact of these ions were re lated to the measured ion-atom cross sections by using the elastic scatteri ng model (ESM). Excellent agreement was found between theory and experiment al data.