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NSLS. fluorescent screen (YAG crystal) and reflection mirror. SSD/ CCD detector. Motor driven incident slits (define the incident x-ray beam size). CCD camera Video camera. upstream beam aperture. 2 nd mirror. Long working distance microscope (10X).

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Presentation Transcript
slide1

NSLS

fluorescent screen (YAG crystal) and reflection mirror

SSD/CCD detector

Motor driven incident slits

(define the incident x-ray beam size)

CCD camera Video camera

upstream

beam aperture

2nd mirror

Long working distance microscope (10X)

sample cell assembly and cubic anvil press (DIA)

double crystal monochromator

Synchrotron x-ray

slide3

Symmetry operation

Rotation

Mirror reflection

Translation

Inversion

Symmetry element

Rotation axis Center of inversion Mirror plane Vector

slide4

Other (complex) symmetry elements

Rotation Inversion Reflection Translation

Rotation --- Roto-inversion axis xxx Screw axis

Inversion --- --- xxx xxx

Reflection --- --- --- Glide plane

Translation --- --- --- ---

slide5

Classification of symmetry elements 1

Proper symmetry elements improper symmetry elements

Rotation axis Inversion center

Translation axis Reflection plane

Screw axis Inversion axis

Glide plane

(do not change shape) (involve shape change)

slide6

Classification of symmetry elements 2

Finite symmetry elements Infinite symmetry elements

Rotation axis Translation axis

Inversion center Screw axis

Reflection plane Glide plane

Inversion axis

(Result in finite number of objects) (Result in infinite number of objects)

slide7

Finite symmetry operations

Crystallographic Rotation axis

N = 1, 2, 3, 4, 5, 6, 7…

slide8

Homework3: (due on Oct. 31)

  • Assuming the following facilities are available:
  • sealed x-ray tube source, curved position sensitive detector, radius 150 mm.
  • sealed x-ray tube source, Bragg-Brentano goniometer, radius 200 mm, scintillation detector.
  • rotating anode source, Bragg-Brentano goniometer, radius 285 mm, scintillation detector.
  • sealed x-ray tube source, Bragg-Brentano goniometer, radius 250 mm, cooled solid state detector.
  • 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)?