From Wikipedia,
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The Debye-Waller factor,
also known as the B factor or the
temperature factor describes the
decrease in scattering intensity
(either from x-ray or neutron
scattering) due to the thermal
motion of the atoms, or due to
crystal disorder. The thermal
motion, or disorder, in some sense
reduces the validity of the Laue
diffraction condition which is
based on fixed atoms.
