A PhD student asked me what causes diffraction anisotropy. Quoting from the Diffraction Anisotropy Server webpage that it is caused by whole-body anisotropic vibration of unit cells. He asked whether a colder cyrostream could improve anisotropy. My answer would be yes, as colder temperatures would lower the vibrations.
My two questions are; (1) am I right? and (2) if so, has it ever been done before in practice? Thanks, Dan
