Abstract
THREE strong bands in the absorption spectrum of chlorine have been analysed and the rotation constants for the normal and excited states of the chlorine molecule determined. These bands have been allocated by Kuhn (Zeits. f. Phys., 39, 77; 1926) to one vibration progression having a common initial level (probably 2) in absorption, the final states being denoted by the arbitrary numbers 5, 6, and 7. The 25 and 27 bands consist of single P and R branches from which a set of term differences can be found for each band, some twelve of one set being in good agreement with the corresponding members of the other set. The 26 band appears to consist of a single series of lines, each of which must, however, be in reality double, since on that assumption a set of term differences can be found which agrees well with the previous ones. These three bands show the phenomenon of alternation of intensity in the lines comprising them, as is to be expected in a symmetrical molecule. The ratio of intensities is approximately 1·4: 1. There are indications that there may be a progressive diminution in this ratio in going from F2 through Cl2 and Br2 to I2, and it is hoped that work on Br2 now in progress in this laboratory (Prof. J. Patkowski) may throw further light on this question.
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ELLIOTT, A. The Isotope Effect in the Spectrum of Chlorine. Nature 122, 997 (1928). https://doi.org/10.1038/122997a0
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DOI: https://doi.org/10.1038/122997a0
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