**Note on Euler angles**

Any arbitrary crystal orientation can be defined by three rotations, and there are a number of standard schemes for which axes and in which order to perform these rotations (Warning, several of these schemes are called Euler angles). When we say Euler angles we mean:

1) First rotate crystal around positive Z axis by alpha degrees (anticlockwise)

2) Then rotate crystal around positive Y axis by beta degrees (anticlockwise)

3) Then rotate crystal around positive Z axis (again) by gamma degrees (anticlockwise)

Z axis is normal to a and b crystallographic axes.

Y axis is the b crystallographic axis.

Z axis is normal to X Y axes, set up system is right handed.

Last Updated on Wednesday, 05 July 2006 18:31