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Problems with Bragg-Brentano diffractometer geometry

Learn about the problems, advantages, and applications of multilayer optics in Bragg-Brentano diffractometer geometry, including issues with specimen errors and parallel beam setups. Discover the principles, performance, and underlying mechanisms of this technology.

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Problems with Bragg-Brentano diffractometer geometry

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  1. Multilayer optics Problems with Bragg-Brentano diffractometer geometry

  2. Multilayer optics Problems with Bragg-Brentano diffractometer geometry axial divergence flat specimen error specimen transparency error specimen displacement error

  3. Multilayer optics Problems with Bragg-Brentano diffractometer geometry disappear w/ parallel beam geometry

  4. Multilayer optics Problems with Bragg-Brentano diffractometer geometry disappear w/ parallel beam geometry Even irregularly shaped specimens OK Can also increase beam intensity

  5. Multilayer optics Problems with Bragg-Brentano diffractometer geometry disappear w/ parallel beam geometry Even irregularly shaped specimens OK Can also increase beam intensity - due to larger capture angle

  6. Multilayer optics Problems with Bragg-Brentano diffractometer geometry disappear w/ parallel beam geometry Even irregularly shaped specimens OK Can also increase beam intensity - due to larger capture angle More monochromatic

  7. Multilayer optics Alternate setup

  8. Multilayer optics Alternate setup increased resolution reduced fluorescence from specimen

  9. Multilayer optics Looks like this

  10. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. How does it work?

  11. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. How does it work?

  12. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. How does it work?

  13. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. How does it work? Performance characterized by rocking curve - fixed 2,  rotates

  14. Multilayer optics How does it work? Performance characterized by rocking curve - fixed 2,  rotates smaller d, lower Z --> more penetration --> narrower curve

  15. Multilayer optics γ - ratio of the thickness of heavy material to thickness of bi-layer Low γ multilayer has narrower rocking curve; higher γ multilayer has wider rocking curve

  16. Multilayer optics γ - ratio of the thickness of heavy material to thickness of bi-layer Low γ multilayer has narrower rocking curve; higher γ multilayer has wider rocking curve Highest reflectivity can be achieved at specific γ, but dependent on coating materials

  17. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. Depth graded coating Yields broadened x-ray spectrum

  18. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. Laterally graded coating When combined w/ curved substrate, can focus

  19. Multilayer optics From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc. Laterally graded coating When combined w/ curved substrate, can focus…….or make parallel beam (parabolic surface)

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