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average isotopic displacement of the first six members being 0.92 cm-'. The mean deviation of observed from calculated dis- placements is only 0.03 cm-, and no trend is evident. By visual estimates the relative intensity of the Sr86F to the Sr88F bands is considerably below that predicted by the calculated abundance ratio, 1 to 5.5. Com- bined with a similar observation by Aston' with the mass-spectrograph, this indicates either an exceptionally large packing fraction for Sr, or an error in the accepted atomic weight. By comparing these spectra in emission and absorption, we are able to draw con- clusioins about the rotational structure of the bands, direct measurement of which cannot be hoped for, even with a large grating. The green and red systems of CaF, and their analogues in SrF, have been ascribed by Johnson2 to transitions 222 and 2rI2T respectively. Our results support these designations, but disagree with Johnson in several important respects. The near equality of rotational constants in the upper and lower states causes the heads to be formed at a very high value of J, at a considerable distance from the band origins. In this case data on the heads cannot give reliable
Physical Review – American Physical Society (APS)
Published: Oct 15, 1930
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