A New Method for Measuring the X-Ray “Pendellösung” Beats at the Center of the Borrmann Fan Using White Radiations

Abstract
A new technique is proposed to measure the X-ray Pendellösung intensity beats using white radiations and parallel-sided single crystals. The beats are measured at the center of the Borrmann fan on the exit surface of a thick Si specimen. The atomic scattering factors of Si are determined for the 220 reflection with an accuracy remarkably higher than that in the previous method.