Abstract
The nature of the thermal diffuse scattering (TDS) from long-wavelength acoustic modes of vibration in a single crystal is examined for time-of-flight neutron diffraction. In the neighbourhood of the Bragg reflections there may be gaps or 'windows' in the energy change of the scattered neutrons, in the wavelengths of both incident and scattered radiation, and in the total time of flight. TDS is forbidden within these windows and rises to a steep maximum at the edges: one maximum is due to phonon emission (Stokes process) and the other to phonon absorption (anti-Stokes). The edges of the windows are determined by the sound velocity in the crystal. The sound velocity is readily derived, without employing energy analysis, by measuring the positions of the edges of the time-of-flight window.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Acta Crystallographica Section A Foundations of Crystallography
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
