naa a22 4500 510774784 CHVBK 20180411083226.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s12210-012-0205-1 doi (NATIONALLICENCE)springer-10.1007/s12210-012-0205-1 Robotti Nadia Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16100, Genoa, Italy aut The discovery of X-ray diffraction [Elektronische Daten] [Nadia Robotti] Starting from the discovery of Roentgen's X-ray (Röntgen 1895), I here reconstruct the various attempts carried out to find X-ray diffraction using very thin wedge-shaped slits. These experiments allowed A. Sommerfeld to achieve, at the beginning of 1912, a qualitative estimate of the wavelength of X-rays around 4×10−9cm. This value was at the base, together with the adoption of the space-lattice model for the crystal, of Laue idea of using a crystal as a diffraction grating for X-ray. Then we will discuss the feasibility of the Laue project, as well as the realization of the experiment, and the first results of W. Friedrich and P. Knipping, with the theoretical interpretation given to them by Laue. Laue's discovery of X-ray diffraction was immediately taken up by William Henry Bragg and re-interpreted by his son William Lawrence in terms of X-ray reflection by the planes of the crystal, thus becoming, in a few months, a formidable tool for the study of crystal structures, as well as for the precise determination of the wavelengths of X-rays (to Bragg father we owe the construction of the first X-ray ionization spectrometer). Particular attention will be given to the works of C. G. Barkla on X-ray absorption, which resulted in the discovery in 1906 of the Roentgen characteristic radiation of the elements. These works strengthened the hypothesis of the wave nature of X-rays, at the expense of the "corpuscular hypothesis” (supported notably by J. Stark and by W.H. Bragg), and represented a solid reference point for the project of Laue. Accademia Nazionale dei Lincei, 2012 M. Laue nationallicence C. G. Barkla nationallicence W. H. Bragg nationallicence W. L. Bragg nationallicence X-ray diffraction nationallicence Rendiconti Lincei Springer Milan 24(2013-02-01), 7-18 2037-4631 24<7 2013 24 12210 https://doi.org/10.1007/s12210-012-0205-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12210-012-0205-1 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Robotti Nadia Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16100, Genoa, Italy aut NATIONALLICENCE 773 0- Rendiconti Lincei Springer Milan 24(2013-02-01), 7-18 2037-4631 24<7 2013 24 12210 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer