Dissociative electron attachment to vibrationally excited H2 molecules involving the 2Sigma+g resonant Rydberg electronic state

Dissociative electron attachment cross sections (DEA) on vibrationally excited H2 molecule taking place via the 2Sigma+g Rydberg-excited resonant state are studied using the local complex potential (LCP) model for resonant collisions. The cross sections are calculated for all initial vibrational levels (vi = 0-14) of the neutral molecule. In contrast to the previously noted dramatic increase in the DEA cross sections with increasing vi, when the process proceeds via the X 2Sigma+u shape resonance of H2, for the 2Sigma+g Rydberg resonance the cross sections increase only gradually up to vi = 3 and then decrease. Moreover, the cross sections for vi >= 6 exhibit pronounced oscillatory structures. A discussion of the origin of the observed behavior of calculated cross sections is given. The DEA rate coefficients for all vi levels are also calculated in the 0.5-1000 eV temperature range.