# Form Factor:Octahedron

From GISAXS

## Equations

For a regular octahedron of edge-length 2*R*

- Volume
- Projected (
*xy*) surface area - Surface area

## Pyramid

The Octagon shaped can be considered to be formed from two square-based pyramids. Similarly the form factor can be computed from appropriate summation of two pyramid form factors.

## See Also

- The chord-length probability density of the regular octahedron S. Ciccariello
*J. Appl. Cryst.*2014, 47 doi: 10.1107/S1600576714011121