X-ray diffraction Biophysics. W. K. Röntgen (1845 – 1923) Wife’s hand.
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X-ray diffraction Biophysics
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Transcript of X-ray diffraction Biophysics. W. K. Röntgen (1845 – 1923) Wife’s hand.
X-ray spectrum of rhodium
qUh max
Λmin
K series
U
345.12min Å
(Duane – Hunt limit)
White radiation
Bremsstrahlung
= AD - BC
(2')
(2)
(1')
(1)
a
D
C
BA
Laue diagram
Condition for constructive interference:
k)cos(cosa 0
Δ = AD - BC
Incident beam
X
Z
Yα0 β0
γ0
(3)
(2)
(1)
ooooooo
ooooooo
ooooooo
ooooooo
o oooooo
Diffraction from 2-D lattice
Incident beamReflected beam
e1/P
m
Sources of secondary X rays
zero order 0
1
3
2
-1
-2
-3third order
P
Row of scatterers
1
1’
Note: If the number of scatterers increases the diffraction pattern becomes sharper