Abstract
HITHERTO all X-ray spectra have been obtained by using the body, the spectrum of which is to be examined, as an antikathode inside the tube. All the trouble of exhausting the tube, etc., can be avoided by illuminating the substance of which the spectrum is to be determined with the primary rays from a tube of any of the usual types, and only allowing the secondary rays to enter the spectrograph. I have photographed the secondary spectra of copper, zinc, mercury (amalgam of zinc), etc., by this method without any trouble. Zinc amalgam, for instance, shows five rays, two due to zinc, one due to some impurity—probably iron—and two due to mercury.
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DE BROGLIE, M. Spectra of Secondary X-Rays. Nature 93, 349 (1914). https://doi.org/10.1038/093349b0
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DOI: https://doi.org/10.1038/093349b0
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