
%0 Journal Article
%A Mackenzie, JK 
%A McL Mathieson, A 
%T The Experimental Value of f(220) for Copper
%J Australian Journal of Physics
%D 1984/12/01
%V 37
%N 6
%P 651-656
%K 
%R https://doi.org/10.1071/PH840651
%U https://www.publish.csiro.au/paper/PH840651 
%X The value of the atomic form factor, /(220), for copper has been determined in recent years by a variety of methods. All the dynamical methods agree on a value in the region of 16'70-16·75. These methods include two X-ray methods, one involving measurement of intensity profiles and the other of Pendellosung beats, and also an electron diffraction measurement using a critical voltage procedure. By contrast, two recent kinematical measurements using y rays both report a distinctly different value of about 16·45. One of these determinations has already been re-examined by the present authors and the iscrepancy removed by an appropriate extrapolation to zero extinction. 
