Abstract
IT is interesting to find that an X-ray bulb having a rhodium antikathode gives off a strong, sharply defined (and therefore very homogeneous) beam which is reflected from the (100) face of rock-salt at a glancing angle of 6·2°. Its mass absorption coefficient in aluminium is 3·2. A second weaker beam is reflected at an angle of 5·8°, and this appears to complete the rhodium X-spectrum. Assuming the correctness of my son's determination of the spacing of the atoms of rock-salt (in a paper read before the Royal Society on June 26), the wavelength of the stronger beam is 0·61 × 10–8, and of the weaker 0·57 × 10–8. It can be calculated that radiation of about this wave-length should be emitted by a rhodium antikathode; the argument is given in a paper recently read before the Royal Society (see abstract on p. 496 of this issue).
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BRAGG, W. The Reflection of X-Rays by Crystals. Nature 91, 477 (1913). https://doi.org/10.1038/091477b0
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DOI: https://doi.org/10.1038/091477b0
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