Rotating Crystal

1
Rotating Crystal
Cullity Figures 3-9 and 3-10

• Constant l, single crystal which is surrounded by
  recording film (film cylinder)
• Crystal is continually rotated about an axis that
  coincides with the film cylinder axis
• If this rotation axis corresponds to the unit
  cell axis of the crystal (i.e. the c-axis), then
  the diffraction cones will all have zone axes
  which correspond to the axis of rotation. The
  intersection of these cones with the cylinder of
  recording film forms circles. Each circle
  corresponds to a constant l.
• As we rotate the crystal about the c-axis, we are
  rotating the reciprocal lattice about the b3 axis
  (see Cullity Figure A1-9).

hkl
Hhkl
2q
HV
000
a
b
HH
2
Rotating Crystal
R
l 1
y
hkl
x
Hhkl
l 0
2q
HV
000
a
b
HH
Film