Motor driven incident slits (define the incident x-ray beam size) Synchrotron x-ray upstream beam aperture CCD camera Video camera Long working distance.

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Presentation transcript:

Motor driven incident slits (define the incident x-ray beam size) Synchrotron x-ray upstream beam aperture CCD camera Video camera Long working distance microscope (10X) 2 nd mirror fluorescent screen (YAG crystal) and reflection mirror sample cell assembly and cubic anvil press (DIA) double crystal monochromator SSD/CCD detector

Symmetry

Rotation Inversion Mirror reflectionTranslation Symmetry operation Symmetry element Rotation axis Center of inversion Mirror plane Vector

Other (complex) symmetry elements RotationInversionReflectionTranslation Rotation--- Roto-inversion axisxxxScrew axis Inversion------xxxxxx Reflection Glide plane Translation

Classification of symmetry elements 1 Proper symmetry elementsimproper symmetry elements RotationaxisInversion center Translation axisReflection plane Screw axisInversion axis Glide plane (do not change shape)(involve shape change)

Classification of symmetry elements 2 Finite symmetry elementsInfinite symmetry elements Rotationaxis Translation axis Inversion center Screw axis Reflection plane Glide plane Inversion axis (Result in finite number of objects) (Result in infinite number of objects)

Finite symmetry operations Crystallographic Rotation axis N = 1, 2, 3, 4, 5, 6, 7…

Homework3: (due on Oct. 31) Assuming the following facilities are available: A.sealed x-ray tube source, curved position sensitive detector, radius 150 mm. B.sealed x-ray tube source, Bragg-Brentano goniometer, radius 200 mm, scintillation detector. C.rotating anode source, Bragg-Brentano goniometer, radius 285 mm, scintillation detector. D.sealed x-ray tube source, Bragg-Brentano goniometer, radius 250 mm, cooled solid state detector. E.Synchrotron x-ray facility, Bragg-Brentano goniometer, radius 100 to 500 mm, cooled solid state detector. 1.If you are to collect powder diffraction data with high resolution, what is the order of these five facilities should you choose? 2.If you have 20 different samples to identify using x-ray diffraction and each facility charges you base on the time used, which facility should you choose (excluding synchrotron facility)?