Abstract
THE oxygen second negative band system is a result of the transition A2Πu − X2Πg. It is a system of red-degraded double-headed bands, extending from 1900 Å to 6500 Å, and the separation of the heads of each band is 200 cm−1. The bands were first observed by Johnson1 and further identifications have been made by other workers2–6. A list of band-head wavelengths, taken from refs. 1–5, has been published by Wallace7. The frequencies of the band heads are given by 
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References
Johnson, R. C., Proc. Roy. Soc., 105, 683 (1924).
Ellsworth, V. M., and Hopfield, J. J., Phys. Rev., 29, 79 (1927).
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Wallace, L., Astrophys. J. Suppl., 7, 165 (1962).
Linton, C., Ph.D., thesis, London (1966).
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LINTON, C. New Identifications in the Oxygen Second Negative System. Nature 212, 1358 (1966). https://doi.org/10.1038/2121358a0
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DOI: https://doi.org/10.1038/2121358a0
