We use the adiabatic-nuclei molecular convergent close-coupling method to perform calculations of 0.01–1000 eV electrons scattering on the $c{}^3\mathrm{\Pi }_u$, $a{}^3\mathrm{\Sigma }_g^{+}$, $B{}^1\mathrm{\Sigma }_u^{+}$, $C{}^1\mathrm{\Pi }_u$, and $EF{}^1\mathrm{\Sigma }_g^{+}$ states of ${\mathrm{H}}_2$ in the $v=0$ vibrational level. Elastic, superelastic, ionization, and grand-total cross sections are presented, as well as cross sections for excitation of the $n=2$–3 singlet and triplet states of ${\mathrm{H}}_2$ (where $n$ is the atomic-limit principle quantum number). Comparison with available theoretical results is made. Good agreement is found with the recent $R$-matrix results [J. Phys. B 53, 245203 (2020)] for most of the exchange and dipole-forbidden transitions, but not for the dipole-allowed transitions. The sources of disagreement were found to be an unconverged partial-wave expansion and the utilization of the fixed-nuclei approximation (as opposed to adiabatic-nuclei) in the $R$-matrix calculations.

• Received 17 December 2020
• Accepted 10 February 2021

DOI:https://doi.org/10.1103/PhysRevA.103.032802