Vibrational Structure in the Dissociative Attachment of Electrons in Hydrogen

Abstract

A series of resonances with spacing 0.3 eV has been observed in the 11.2- to 12.5-eV range of the cross section for production of ${\mathrm{H}}^{\ensuremath{-}}$ by dissociative attachment of electrons in ${\mathrm{H}}_{2}$. Comparison is made with resonances in the elastic scattering and vibronic excitation. Mechanisms involving vibrational levels of quasibound, excited states of ${\mathrm{H}}_{2}^{\ensuremath{-}}$ are discussed.