Dissociative electron attachment to vibrationally excited H-2 molecules involving the (2)Sigma(+)(g) resonant Rydberg electronic state

Dissociative electron attachment cross sections (DEA) on vibrationally excited H-2 molecule taking place via the (2)Sigma(+)(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 (v(i) = 0-14) of the neutral molecule. In contrast to the previously noted dramatic increase in the DEA cross sections with increasing v(i), when the process proceeds via the X (2)Sigma(+)(u) shape resonance of H-2, for the (2)Sigma(+)(g) Rydberg resonance the cross sections increase only gradually up to v(i) = 3 and then decrease. Moreover, the cross sections for v(i) >= 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 v(i) levels are also calculated in the 0.5-1000 eV temperature range. (C) 2011 Elsevier B.V. All rights reserved.