Abstract
IN 1923, Compton gave a theory with experimental verifications of scattering of hard X-rays by free electrons, and in a subsequent paper he considered theoretically the case of modification of radiation scattered by bound electrons (Compton: “X-rays and Electrons”, p. 286) in which the latter may be removed from one orbit to the other. Recently, I have observed that a Part of the monochromatic X-rays in passing through carbon undergoes a change in frequency and appears on the longer wave-length side of the primary radiation. Copper Kα radiation was allowed to pass through carbon soot and the transmitted radiation was analysed by a calcite crystal fitted up in a Siegbahn spectrograph. A current of 8 m.a. was passed through the X-ray tube at a peak voltage of 28 k.v. In addition to the original copper Kα radiations and other lines in the tungsten L-series, a new diffuse broad line of wave-length 1592 X.U. (v/R = 572) appeared on the photographic plate. This new line appears to have a more or less sharp edge on the short wave-length side. The wave-length of this line was compared with those of other lines the presence of which might be expected from the X-ray tube excited under the given condition and was found not to coincide with any one of them. The time of exposure was varied from 8 to 14 hours in different cases and all of them showed the same effect.
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RAY, B. Scattering of X-rays by bound Electrons. Nature 125, 746 (1930). https://doi.org/10.1038/125746a0
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DOI: https://doi.org/10.1038/125746a0
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