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Structure of K -radiation from c, b, and be

Structure of K -radiation from c, b, and be 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Structure of K -radiation from c, b, and be

Physical Review , Volume 36 (8) – Oct 15, 1930
2 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1930 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.36.1414
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Oct 15, 1930

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