Resonant vibrational excitation (RVE) cross sections have been calculated for the electron-H2 molecule collisions in the energy range 11–14 eV involving the 2Σ+g excited electronic state of the molecular hydrogen ion H2−. This state, whose threshold is located around 14 eV, gives rise to the so-called series a of the observed peaks in electron-impact differential cross-section measurements. The calculations have been performed within the local complex potential approximation by using the available theoretical potential energy and width for the 2Σ+g resonant state. The cross sections for all vi=0→vf=1–14 RVE transitions have been calculated. A satisfactory agreement of calculated cross sections with the available experimental data is obtained.
Celiberto R, Janev RK, Wadehra JM, Laricchiuta A. Cross sections for 11–14-eV e-H2 resonant collisions: Vibrational excitation. Phys. Rev. A. 2008;77(1):eP012714. doi: 10.1103/PhysRevA.77.012714