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The absorption of monochromatic x-rays as a function of the wave-length has been measured for gaseous krypton, bromine and hydrogen bromide in the region of the absorption edges. The data were taken with a double crystal spectrometer with a G-M counter to measure the x-ray intensities. The structure for krypton is considerably different from that previously obtained for argon. The data for Br₂ and HBr are of sufficient accuracy so that they may be used to check the Kronig-Petersen theory quantitatively.
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C. H. Shaw (1940) studied this question.
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