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The global potential energy surfaces of the first six singlet electronicstates of CO$_2$, 1---3$^1/!A'$ and 1---3$^1/!A"$ are constructed using highlevel ab initio calculations. In linear molecule, they correspond to$\tilde{X}^1\Sigma_g^+$, $1^1\Delta_u$, $1^1\Sigma_u^-$, and $1^1\Pi_g$. Thecalculations accurately reproduce the known benchmarks for all states andestablish missing benchmarks for future calculations. The calculated statesstrongly interact at avoided crossings and true intersections, both conical andglancing. Near degeneracies can be found for each pair of six states and manyintersections involve more than two states. In particular, a fivefoldintersection dominates the Franck-Condon zone for the ultraviolet excitationfrom the ground electronic state. The seam of this intersection traces out aclosed loop. All states are diabatized, and a diabatic $5\times 5$ potentialmatrix is constructed, which can be used in quantum mechanical calculations ofthe absorption spectrum of the five excited singlet valence states.

Photodissociation of carbon dioxide in singlet valence electronic states. I. Six multiply intersecting ab initio potential energy surfaces