1. Spinning Star: a precession method for electron diffraction installed on the Philips CM20 TEM
Increase the number of visible reflections
more information
"correct" for slight misalignement on zone axis
nicer patterns!
provides intensities closer to the kinematical ones
interpretation of intensities: Debye-Waller factors, structure factors and crystal structure determination
new routine in JEMS for precession (Thanks to Pierre!)
reveals some components of the true symmetry hidden by dynamical effects
phase identification, crystal structure determination

2. precession tilt out of zone axis Ewald sphere reciprocal lattice
kinematic
(002) absent
precession
tilt out of zone axis
dynamic 65nm
(002) present
(002) very weak
precession 4°
Ewald sphere
reciprocal lattice

3. precession tilt out of zone axis Ewald sphere reciprocal lattice
kinematic
(002) absent
precession
tilt out of zone axis
dynamic 65nm
(002) present
(002) very weak
precession 4°
Ewald sphere
reciprocal lattice

4. centering the pattern on zone axis and enhancing the spots visibility in thick crystals
by courtesy of Micromegas

5. revealing (part of) the true symmetry
by courtesy of Micromegas