Five band systems of PF and one of PF+ have been excited in a discharge through PF3 and have been photographed with a high resolution spectrograph. The rotational fine structures of a number of bands of each system have been analyzed and the rotational and vibrational constants determined. The principal constants for a 3Σ state of PF, which is believed to be the ground state, are ωe = 846.75 cm−1, Be = 0.5665 cm−1, re = 1.590 0 Å.
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Douglas et al. (1962) studied this question.
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