chem5410 q1 2/20 & 2/27/’06
DESCRIPTION
Chem5410 Q1 2/20 & 2/27/’06. 1. What is so-called a single-crystal?. 2. What is so-called a powder sample?. 3. Does a powder sample contain single crystals?. 4. What’s the difference between single-crystal diffraction and powder diffraction?. - PowerPoint PPT PresentationTRANSCRIPT
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Chem5410 Q1 2/20 & 2/27/’06
1. What is so-called a single-crystal?
2. What is so-called a powder sample?
3. Does a powder sample contain single crystals?
4. What’s the difference between single-crystal diffraction and powder diffraction?
5. What is Bragg Law? And what’s the use of it in structure analysis ?
6. In diffraction experiments, what’s the X-ray wavelength used in SXRD? And what’s the X-ray wavelength used in PXRD?
7. What is the suitable size of single crystal for SXRD measurements?
8. How X-rays are generated?
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Chem5410 Q2 2/27 & 3/06/’06
1. What are so-called cell constants? How many should be determined?
2. What are so-called the external symmetry of a crystal?
3. What are so-called the internal symmetry of a crystal?
4. What point symmetry groups are possessed by crystals?
5. What is so-called a space group?
6. How to define crystal planes?
7. What’s relationship between lattice planes and cell constants?
8. What’s the so-called the seven crystal
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Chem5410 Q3 3/06/’06
1. What are so-called structure Factors?
2. What are so-called lattice types?
3. What are so-called the 14 Bravais lattices?
4. How to determine the cell constants for a crystalline sample?
5. How to determine the correct unit cell for a crystalline sample?
6. How to determine the correct point group for a crystal lattice?
7. What’s the relationship between crystal lattice and diffraction pattern?
8. Why XRD patterns exhibit symmetries?
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N2A
C2A
O1B
O3N2
C1A
C2
ZN1
O3
O3C
N1
O1A
N2B
C1
P2
C1B
O1C
O3B
C2B
P1
O4
O1
O2
O5
ab
c
ORTEP for ZnP1