Practical Electron Microscopy and Database

An Online Book, Second Edition by Dr. Yougui Liao (2006)

Practical Electron Microscopy and Database - An Online Book

Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix

Disk Size/Radius in CBED

The disk diameter (size) in CBED is related to the convergence angle (α) for forming the patterns. In other words, the diameter (d) of the bright-field disk in Figure 1991 is a function of the α and the wavelength (λ), given by,

       d = 2α/λ ---------------------- [1991]

CBED disk diameter

Figure 1991. CBED disk diameter.