Transcript Diffraction in TEM

EM Course – Elastic Scattering
Professor Rodney Herring
Diffraction in TEM - Introduction
Diffraction in TEM - Introduction
Diffraction in TEM - Introduction
Diffraction in TEM - Introduction
Wave Propagation Vector, K
Wave Propagation Vector, K
Wave Propagation Vector, K
or
Scattering From A Crystal
Scattering From A Crystal
Defects in GaAs/InGaAs Laser
Note that the laser looks to have a perfect crystal structure when using g=200[011],
electron diffraction vector at the zone axis [011], but actually has dislocations,
which moved into the active region by creep, when viewed using different
diffraction contrast imaging conditions using g=220[110] diffraction vector at
the [110] zone axis.
Diffraction From Planes
Diffraction From Planes
Diffraction From Planes
Diffraction From Planes
Diffraction From Planes
Diffraction From Planes
Dynamic Diffraction
Diffraction From Zone Axis
02 2
2 02
The [111] zone axis of Al
Note that g  u  0
220
Selected Area Diffraction
Selected Area Diffraction
Selected Area Diffraction
Selected Area Diffraction
TEM Diffraction Summary