Fig. 1
Swan band transitions and structure of the rotational energy levels of 
for the d3Πu and a3Πg states. The dotted lines correspond to missing levels. The Q3 lines have a zero transition probability, according to the Hönl-London factors given in Table 2. The Q2 and Q1 relative transition probabilities (compared to the P and R lines) rapidly decrease with increasing J values.
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