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Grating tuning the helium-fluorine laser has led to single line output at 6967, 7037, 7128, 7202, 7311, 7489, 7755, and 7800 Å. A study of the pressure dependence of the output intensities of these lines unambiguously identifies them as transitions between the 2s2p4(3P)3p and 2s2p4(3P)3s configurations of fluorine.
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Hocker et al. (1976) studied this question.
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