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Diffraktometrie unter streifendem Einfall … Diffraktometrie unter streifendem Einfall (grazing incidence diffraction, GID) ist ein Verfahren zur Untersuchung der Kristallstruktur dünner Schichten. Dazu wird eine Probe unter kleinen Winkeln mit
* Röntgenstrahlung (englisch grazing incidence X-ray diffraction, GIXD) oder
* Neutronenstrahlung (englisch grazing incidence neutron diffraction, GIND) beleuchtet und die gebeugte Strahlung analysiert. Diffraktometrie unter streifendem Einfall zeichnet sich durch einen besonders flachen Einfallswinkel der Strahlung auf die Probe aus (α < 3°; gesehen nicht von der Normalen zur Probenoberfläche, sondern von der Oberfläche selbst).läche, sondern von der Oberfläche selbst).
, Grazing incidence X-ray and neutron diffra … Grazing incidence X-ray and neutron diffraction (GID, GIXD, GIND), typically from a crystalline structure uses small incident angles for the incoming X-ray or neutron beam, so that diffraction can be made surface sensitive. It is used to study surfaces and layers because wave penetration is limited. Distances are in the order of nanometres. Below (typically 80%) the critical angle of the surface material studied an evanescent wave is established for a short distance and is exponentially damped. Therefore, Bragg reflections are only coming from the surface structure. An advantage of GIXD is that the electric field at the critical angle is amplified locally by a factor of four, making the signal stronger. A disadvantage is the limited in-plane spatial resolution (beam footprint). When very small scattering angles are being studied, the technique is called grazing-incidence small-angle scattering (GISAS, GISAXS, GISANS), and requires special methodology.GISANS), and requires special methodology.
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| rdfs:comment |
Diffraktometrie unter streifendem Einfall … Diffraktometrie unter streifendem Einfall (grazing incidence diffraction, GID) ist ein Verfahren zur Untersuchung der Kristallstruktur dünner Schichten. Dazu wird eine Probe unter kleinen Winkeln mit
* Röntgenstrahlung (englisch grazing incidence X-ray diffraction, GIXD) oder
* Neutronenstrahlung (englisch grazing incidence neutron diffraction, GIND)azing incidence neutron diffraction, GIND)
, Grazing incidence X-ray and neutron diffra … Grazing incidence X-ray and neutron diffraction (GID, GIXD, GIND), typically from a crystalline structure uses small incident angles for the incoming X-ray or neutron beam, so that diffraction can be made surface sensitive. It is used to study surfaces and layers because wave penetration is limited. Distances are in the order of nanometres. Below (typically 80%) the critical angle of the surface material studied an evanescent wave is established for a short distance and is exponentially damped. Therefore, Bragg reflections are only coming from the surface structure.re only coming from the surface structure.
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| rdfs:label |
Diffraktometrie unter streifendem Einfall
, Grazing incidence diffraction
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