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https://www.nist.gov/laboratories/tools-instruments/silicon-crystal-lattice-comparator-delta-d-laboratory/feedstock

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-  Diffraction Metrology and Standards  Expand or Collapse    -  Powder Diffraction SRMs 
  -  The Divergent Beam Diffractometer (DBD) Laboratory 
  -  The Parallel Beam Diffractometer (PBD) Laboratory  Expand or Collapse      -  Precision X-ray Emission Line Measurements 
  -  The Silicon Crystal Lattice Comparator (Delta-d) Laboratory  Expand or Collapse      -  Feedstock verification of silicon boules for SRM640g 

# Feedstock verification of silicon boules for SRM640g

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Comparison of the left-beam and right-beam diffraction patterns from float-zone silicon.  The central peak offset is related to the lattice spacing difference from the transfer crystal. The horizontal scale is in raw angle-interferometer fringes, where 1 fringe is roughly 0.775 μrad (0.16 second of arc).  The instrumental angular resolution is approximately 1 nrad.

The incoming intrinsic float-zone silicon boules which will become SRM640g were verified for quality by measuring their lattice spacing.  The ability to make such a measurement assured the original crystal is nearly perfect, with very low strain and defect density.  The sharp, central fringe in the image will not appear on a crystal with significant imperfections.

-  **‹** The Silicon Crystal Lattice Comparator (Delta-d) Laboratory 

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