Abstract
In light of recent fluorescence spectra obtained for the 5397 Å system of Cu 3, this system is reassigned as à 2A 1-X̃ 2E'. This assignment explains the observed bands without the need to invoke vibronic or Coriolis perturbations. It also accounts for the anomalous pattern of linewidths observed for the higher vibronic levels of the à 2A 1 state as unresolved splittings of the multiply excited doubly degenerate bending mode. The implications for the analysis of the ground state potential energy surfaces are discussed.
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