Abstract
The potential energy surfaces corresponding to the long-lived fixed-nuclei electron scattering resonances of ${\mathrm{H}}_{2}\mathrm{O}$ relevant to the dissociative electron attachment process are examined using a combination of ab initio scattering and bound-state calculations. These surfaces have a rich topology, characterized by three main features: a conical intersection between the $^{2}A_{1}$ and $^{2}B_{2}$ Feshbach resonance states; charge-transfer behavior in the $\mathrm{OH}\phantom{\rule{0.2em}{0ex}}(^{2}\ensuremath{\Pi})+{\mathrm{H}}^{\ensuremath{-}}$ asymptote of the $^{2}B_{1}$ and $^{2}A_{1}$ resonances; and an inherent double-valuedness of the surface for the $^{2}B_{2}$ state the ${C}_{2v}$ geometry, arising from a branch-point degeneracy with a $^{2}B_{2}$ shape resonance. In total, eight individual seams of degeneracy among these resonances are identified.
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