
%0 Journal Article
%A Willis, BTM 
%T Measurement of Thermal Diffuse Scattering Using Pulsed Neutron Diffraction
%J Australian Journal of Physics
%D 1988/06/01
%V 41
%N 3
%P 477-488
%K 
%R https://doi.org/10.1071/PH880477
%U https://www.publish.csiro.au/paper/PH880477 
%X Collective excitations in crystals can be examined with neutrons by means of the so-called 'diffraction method', without carrying out an energy analysis of the inelastically scattered neutrons. For studying thermal diffuse scattering (I'DS) from acoustic phonons, it is particularly advantageous to employ a white source of pulsed neutrons instead of a monochromatic source of reactor neutrons. Provided that the neutron velocity is less than the sound velocity in the crystal, each reciprocal-lattice point observed in backscattering Laue geometry is associated with a wavelength window within which TDS is forbidden. The edges of the window are readily measured to give the sound velocity as a function of the direction of propagation. 
