RHEED Pattern for various surfaces:

Figure 8.05 demonstrates various types of RHEED patterns for different types of surfaces. The ideal smooth surface provides a clear dot patterns, which is typically distracted to be streaks for the reality smooth surfaces.

Figure 8.05: Various types of RHEED patterns for different types of surfaces.

• RHEED patterns change to different nature for typical 3D clusters and exhibit a continuous line profile for a polycrystal.

LEED versus RHEED:

In LEED, low energy electrons provide large elastic scattering cross-section for back-scattered electrons with short penetration depth (see Figure 8.06).

In RHEED, high energy electrons provide large elastic scattering cross-section for forward-scattered electrons with a grazing incidence to keep short penetration depth (see Figure 8.06).