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Hace 9 horas · 1932 - Vadim E. Lashkaryov and Ilya D. Usyskin determined of the positions of hydrogen atoms in ammonium chloride crystals using electron diffraction. [95] 1934 - Arthur Patterson introduced the Patterson function which uses diffraction intensities to determine the interatomic distances within a crystal, setting limits to the possible phase values for the reflected x-rays.
