Fe4N and PAS

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    Jannes
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    Assuming that unlike in the video we here assume Fe-IIa and Fe-IIb are different we have :

    For FE-I there is a 4-fold rotation axis along the yellow arrow on the figure above. This means it can be chosen as z-axis of the PAS and in this system eta will be zero (axial symmetry).

    For Fe-IIa there are two-fold rotation axes both parallel to the yellow arrow and on the line connecting it to the N. This can be used as base for a PAS.

    For Fe-IIb finally there is a 4-fold rotation axis parallel to the yellow arrow which can be used as axis for a PAS to get a system where eta=0.

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