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agre
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watson
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yonath

resources

commissions

aperiodic crystals
biological macromolecules
quantum crystallography
crystal growth and characterization of materials
crystallographic computing
crystallographic nomenclature
crystallographic teaching
crystallography in art and cultural heritage
crystallography of materials
electron crystallography
high pressure
inorganic and mineral structures
international tables
journals
magnetic structures
mathematical and theoretical crystallography
neutron scattering
NMR crystallography
powder diffraction
small-angle scattering
structural chemistry
synchrotron radiation
xafs

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calendar
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- Letter from the President
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- Phase problem
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- A. T. H. Lenstra (1942-2002)
- Edward C. Lingafelter (1914-2003)
- Henri A. Levy (1913-2003)
- Mary E. Mrose (1912-2003)
- Polymorphism in Molecular Crystals
- Enjoy Your Cells
- XX Congress and General Assembly update

Top: Scan of 18 single orders. Middle: Measured Fourier spectrum over a total of 1704 orders of the copper *K*α_{1}–*K*α_{2} doublet. 4 beat nodes are recognizable. Bottom: Calculated Fourier spectrum of the same order range.

The first Michelson interferometer for hard X-rays [A. Appel and U. Bonse (1991). *Phys. Rev. Lett.* **64**, 1673–1676] featured geometric path-length differences of interfering beams of about 120 nm corresponding to 750 orders at wavelength λ ≈ 0.15 nm. Using the same design principle, i.e. mixing of Laue- and Bragg-case beams diffracted by only one set of Bragg planes of two separate structures of perfect silicon crystals, the scan range could be extended by a factor of 3.6 by modifying the beam-path geometry. 2700 interference orders of the copper *K*α_{1}–*K*α_{2} doublet, corresponding to six beat nodes of the doublet, were recorded in Fourier spectrometric mode as shown in the diagram. Based on the know-how gained in this study, an extension to 40000 orders, equivalent to a spectroscopic resolution λ/Δλ ≈ 20000, appears feasible.

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