The Debye-Waller factor (DWF), named after
Peter Debye and Ivar Waller, is used in
condensed matter physics to describe the attenuation of
x-ray scattering or
neutron scattering caused by thermal motion or quenched disorder. It has also been called the B factor or the temperature factor.The DWF depends on q, the absolute value of the scattering vector q. For a given q, DWF(q) gives the fraction of elastic scattering; 1-DWF(q) correspondingly the fraction of inelastic scattering. In
diffraction studies, only the elastic scattering is useful; in crystals, it gives rise to distinct
Bragg peaks. Inelastic scattering events are undesirable as they cause a diffuse background — unless the energies of scattered particles are analysed, in which case they carry valuable information (
inelastic neutron scattering).
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A fungal incompatibility factor. It operates in the Basidiomycetes species Schizophyllum commune (not to be confused with Factor B of the immune system).
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