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X-ray Crystallography02:18

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

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X-ray near-field speckle: implementation and critical analysis.

Xinhui Lu1, S G J Mochrie, S Narayanan

  • 1Department of Physics, Yale University, New Haven, CT 06511, USA. xlu@bnl.gov

Journal of Synchrotron Radiation
|October 15, 2011
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Summary
This summary is machine-generated.

A new X-ray near-field speckle (XNFS) technique enables studying colloidal dynamics at longer length scales. Researchers demonstrated its capability but also identified limitations for static structure characterization.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Coherence-based X-ray near-field speckle (XNFS) is a novel technique.
  • Synchrotron X-rays offer high brilliance for scattering experiments.
  • Interference between incident and scattered beams creates speckle patterns.

Purpose of the Study:

  • To implement and evaluate the X-ray near-field speckle (XNFS) technique.
  • To assess XNFS for studying static structures and dynamics.
  • To compare XNFS with traditional far-field X-ray scattering methods.

Main Methods:

  • Implementation of XNFS at the 8-ID-I beamline at the Advanced Photon Source.
  • Development of a micrometer-resolution XNFS detector with a high numerical aperture microscope objective.
  • Characterization of dilute silica and polystyrene colloidal samples.

Main Results:

  • Demonstrated capability of XNFS for studying dynamics at longer length scales.
  • Observed low-contrast speckles due to interference between incident and scattered beams.
  • Identified limitations of XNFS, particularly for static structure characterization.

Conclusions:

  • XNFS is a promising technique for studying colloidal dynamics.
  • Further development is needed to overcome limitations in static structure analysis.
  • XNFS offers potential for exploring structures at length scales beyond traditional methods.