The determination of the atomic scattering factor of germanium by a Pendellösung method

The atomic scattering factor of germanium has been obtained from measurements of the Pendellösung period in wedge-shaped single crystals with a three-crystal X-ray spectrometer. For the 220 reflexion the value is 23.78±0.35, in good agreement with the theoretical value of 23.76. Fine structure in the profile of the rocking curves has been observed in thickness regions close to Pendellösung minima.