Measurements of two band-systems attributed to CF are reported. A rotational analysis of four bands, 1,0, 0,0, 0,1 and 1,1, of a transition A 2 Σ + - X 2 II is given, and the vibrational analysis of a system B (near case b) - X 2 II. The rotational constants of the B state have been estimated from band-head separations. X 2 II is probably the ground-state of CF. The initial convergence of the vibrational levels in B is rather rapid, and suggests that D 0 " is about 4.9 6 eV Constants derived are as follows:
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Andrews et al. (1951) studied this question.
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