Reference no: EM131924533
Question 1. Mathematically show that no diffraction can be recorded for
- All odd reflections in 0k0 direction with a two fold lying along the b axes.
- All h+k+l≠2n reflections in I222 spacegroup
Question 2. Can you differentiate between I222 and I212121 from diffraction pattern. Calculate the diffraction conditions to justify your answer.
Question 3. Draw diagrams to deduce the systematic absences for
A 31 axis in vertical direction
A 43 axis in vertical direction
Question 4. Calculate the separation between two spots corresponding to hkl values 20,10,10 and 21,10,10 with a,b,c axes being 500Angstrom (A) , 350A and 400A respectively in a detector placed 100nm away from the crystal . Assume the crsytal belongs to P222 spacegroup.
Question 5. For a crystal mounted such a way that only h00 reflections can only be observed, five spots were found to lie in a straight line in the detector at 54.6, 60.91, 67.51, 74.46and 81.81mm away from the center. The detector was placed at 150mm from the crsytal and the source was a home source with cu kα (1.5418Angstrom) rotating anode. Calculate the a axes of the crystal latticee.
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