New interpretation of resonances inH2−

The two interspersed series of resonances experimentally observed in $e$-${\mathrm{H}}_2$ scattering at 11-13 eV are identified as ${{}_{}{}^2{}_{}{}^{}\Sigma _g^{}{}_{}{}^{}}^{+}$ (series I) and ${}_{}{}^2{}_{}{}^{}\Delta _g^{}{}_{}{}^{}$ (series II), both in the configuration $\left(1s{\sigma }_g\right){\left(2p{\pi }_u\right)}^2$. This interpretation leads to a natural explanation that series I is strong while series II is weak in the $X{{}_{}{}^1{}_{}{}^{}\Sigma _g^{}{}_{}{}^{}}^{+}$ and in the $B{{}_{}{}^1{}_{}{}^{}\Sigma _u^{}{}_{}{}^{}}^{+}$ channels, and that the two series are equally strong in the $c{}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$ channel. Angular distributions for these resonances are computed and compared with experiment. Some old expressions are corrected, and new expressions are given for decay into the $c{}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$ channel.