To account for the broad peaks in Fig we assume that the zero-point vibrational level of the 6 2 A' state is mixed with the dense manifolds of vibrational states built on the 5 2 A', 3 2 A² and 4 2 A' states, as indicated by the uppermost horizontal line in Fig. . We propose that the most favorable transitions back down to the ground state will approximately preserve the vibrational energy of the excited state (transitions down to the levels indicated by the bold horizontal bars in Fig. ). Hence, the intensity maximum of the feature at 24860 cm -1 would correspond to the 5 2 A'®𝑋 ) 1 2 A' transition. The 3 2 A²®𝑋 ) 1 2 A' emission feature has an intensity maximum at an energy that is close to the 22433 cm -1 band characterized by means of LIF. The energy of this LIF band is marked on Fig. . Lastly, the feature 20840 cm -1 is consistent with the 4 2 A'®𝑋 ) 1 2 A' transition.