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If argon mixed with a small amount of NF 3 is pumped rapidly through a mild discharge, a green glow is observed downstream from the discharge. This emission has been photographed with a high dispersion spectrograph and found to consist of a strong band with a head at 5 288 Å and a number of weaker bands. A rotational analysis of the bands has shown that they are the b 1 Σ + –X 3 Σ − bands of the NF molecule. The constants of the two states have been determined and it is found that for the ground state, ω e = 1 141.37 cm −1 and r e = 1.317 3 Å.
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Douglas et al. (1966) studied this question.
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