Bilbao Crystallographic Server Help

Transform Tensor

Input of the program:

• The type of tensor





• The point group

One can select the point group directly from a menu or one can introduce the space group number.





• Orientation

Giving the Euler angles one can introduce the orienation in the following form:

Output of the program:

• The original tensors

The program shows the untransformed tensors.



• The transformed tensors

The program calculate the transformation of the tensors and it relabeled the parameters of the new tensors. After the table which contains the information about the new tensors there is a link which shows how are related the transformed parameters with the original ones.

Example

• Raman Tensors

In the input of the program it is selected the Raman tensor type and the point group C_4v (4mm). The next information one have to introduce is the orientation:

θ = 90;       φ = 0;       Ψ= 0

Once all the parameters are introduced, click on the button Continue and the program will calculate the Raman tensors in the given orientation. In the first part of the output one can find the information about the original Raman tensors:



After this one can find the transformed Raman tensors and the matrix form for the rotation one had introduced by the Euler angles:


After the table there is a link where one can obtain the relations between the old and new parameters of the tensors.