Abstract
In recent measurements of the cross-section for dissociative recombination of H+3 a strong enhancement feature was found which is several eV wide and centered near 9.5 eV incident electron energy. We show this peak is due to four autoionizing states of H3. We also find that three of these resonance states cross along the symmetric stretch seam of the potential energy hypersurface. Such triple intersections may be expected in any polyatomic system which is of high enough symmetry to allow degenerate molecular orbitals. Their existence can profoundly affect the nuclear dynamics on these surfaces in a manner similar to that found in the more common cases of conical intersections between two surfaces. The calculation and characterization of these states will be described.
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