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The low-energy electron-impact dissociation of molecular hydrogen has been asource of disagreement between various calculations and measurements fordecades. Excitation of the ground state of H$_2$ into the dissociative $b^3\Sigma_u^+$ state is now well understood, with the most recent measurementsbeing in excellent agreement with the molecular convergent close-coupling(MCCC) calculations of both integral and differential cross sections (2018Phys. Rev. A 98 062704). However, in the absence of similar measurements forvibrationally-excited or isotopically-substituted H$_2$, cross sections fordissociation of these species must be determined by theory alone. We haveidentified large discrepancies between MCCC calculations and the recommended$R$-matrix cross sections for dissociation of vibrationally-excited H$_2$,D$_2$, T$_2$, HD, HT, and DT (2002 Plasma Phys. Contr. F. 441263-1276,2217-2230), with disagreement in both the isotope effect anddependence on initial vibrational level. Here we investigate the source of thediscrepancies, and discuss the consequences for plasma models which haveincorporated the previously recommended data.

Isotopic and vibrational-level dependence of H$_2$ dissociation by electron impact