The Electromagnetic Spectrum

1
The Electromagnetic Spectrum
2
Electromagnetic Plane Wave
3
Bragg Reflection
q
a
To satisfy both
c
q a
e
a
b
d
q
Braggs Law
a
e
a
d
c
b
Figure 3-2, Cullity
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Diffraction
q
q
q
q
C
A
C
A
D
(200)
F
(100)
E
B
B
2nd order (100) diffraction 1st order
(200) diffraction
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Diffraction Angles
cubic
orthorhombic
hexagonal
rhombohedral
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Diffraction Methods
a
S
Soa
a
So
Sa
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Diffraction Reciprocal Lattice
Diffracted beam
Hhkl (S - So)/l
S/l
q
Incident beam
q
q
So/l
(hkl)
Reciprocal-lattice origin
Ewald sphere
S and So are unit vectors