Experimental study of dissociative attachment inH2:Effects of vibrational excitation

Abstract

Dissociative electron attachment (DA) to ${\mathrm{H}}_{2}$ has been studied by measuring the outgoing kinetic energies of the ${\mathrm{H}}^{\mathrm{\ensuremath{-}}}{(1s}^{2}),$ with $\mathrm{H}(\mathrm{nl})$ in $n=1$ and 2 exit channels. The electron energies ${E}_{e}$ studied are 3--16 eV. Effects of vibration-rotation population in ${\mathrm{H}}_{2}$ are seen, and the DA results herein are modeled in terms of known cross sections for attachment from ${\mathrm{H}}_{2}{(v}^{\ensuremath{''}}{,J}^{\ensuremath{''}}).$ Use is made of magnetically confined electron and ion beams with trochoidal deflection to measure outgoing ion energies.