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Problems with Bragg-Brentano diffractometer geometry PowerPoint Presentation

Problems with Bragg-Brentano diffractometer geometry

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

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

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

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

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

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

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

Problems with Bragg-Brentano diffractometer geometry

Problems with Bragg-Brentano diffractometer geometry

axial divergence

flat specimen error

specimen transparency

error

specimen displacement

error

Problems with Bragg-Brentano diffractometer geometry

disappear w/ parallel beam geometry

Problems with Bragg-Brentano diffractometer geometry

disappear w/ parallel beam geometry

Even irregularly shaped specimens OK

Can also increase beam intensity

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

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

Alternate setup

Looks like this

How does it work?

How does it work?

How does it work?

How does it work?

Performance characterized by rocking curve - fixed 2, rotates

How does it work?

Performance characterized by rocking curve - fixed 2, rotates

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

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

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

Depth graded coating

Yields broadened x-ray spectrum

Laterally graded coating

When combined w/ curved substrate, can focus

Laterally graded coating

When combined w/ curved substrate, can focus…….or make parallel beam (parabolic surface)

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