Powder Diffraction - Spallation Neutron Source
Powder Diffraction - Spallation Neutron Source
Powder Diffraction - Spallation Neutron Source
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Microstrain Broadening<br />
See GSAS Manual, pp 158-167.<br />
S =100% p<br />
18000<br />
GSAS fits strain broadening with two<br />
profile terms:<br />
• LY -> Lorentzian (most common)<br />
• GU -> Gaussian<br />
(note that GU also has an instrumental<br />
contribution)<br />
Relation between strain (as percentage) and GSAS terms:<br />
p<br />
LY S =100%<br />
18000 GU - GUI where GU I accounts for the instrumental contribution<br />
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