The Origin of the Satellites in the Ultraviolet OH Bands

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IN a letter in NATURE of February 7, 1925, p. 194, G. H. Dieke suggests that the numerous satellites in the ultraviolet OH bands originate in the same quantum states of the molecules as do the main lines. The test of this supposition is to see whether or not these faint lines are additional combinations between the same terms which are given for the principal lines, but sufficiently precise measurements for the application of this criterion have not been available. I have therefore remeasured the λ3064 band, using a high dispersion plate (1.3 Å.U. per mm.) on which this band was strongly developed, the main lines being necessarily over-exposed in order that the satellite system be well brought out.

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