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Problems with Bragg-Brentano diffractometer geometry - PowerPoint PPT Presentation


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

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Multilayer optics

Problems with Bragg-Brentano diffractometer geometry


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Multilayer optics

Problems with Bragg-Brentano diffractometer geometry

axial divergence

flat specimen error

specimen transparency

error

specimen displacement

error


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Multilayer optics

Problems with Bragg-Brentano diffractometer geometry

disappear w/ parallel beam geometry


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Multilayer optics

Problems with Bragg-Brentano diffractometer geometry

disappear w/ parallel beam geometry

Even irregularly shaped specimens OK

Can also increase beam intensity


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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


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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


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Multilayer optics

Alternate setup


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Multilayer optics

Alternate setup

increased resolution

reduced fluorescence from specimen


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Multilayer optics

Looks like this


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc l.jpg

Multilayer optics

From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc.

How does it work?


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc11 l.jpg

Multilayer optics

From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc.

How does it work?


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc12 l.jpg

Multilayer optics

From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc.

How does it work?


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc13 l.jpg

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


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Multilayer optics

How does it work?

Performance characterized by rocking curve - fixed 2,  rotates

smaller d, lower Z --> more penetration --> narrower curve


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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


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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


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc17 l.jpg

Multilayer optics

From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc.

Depth graded coating

Yields broadened x-ray spectrum


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc18 l.jpg

Multilayer optics

From Principles, Performance and Applications of Multilayer OpticsSrivatsan Seshadri, Osmic, Inc.

Laterally graded coating

When combined w/ curved substrate, can focus


From principles performance and applications of multilayer optics srivatsan seshadri osmic inc19 l.jpg

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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