Equation of a Conic in the Sample Surface Plane Coordinate System CS

3 Equation of a Conic in the Sample Surface Plane (Coordinate System CS) 

In the coordinate system related to the sample we have for the component of the direction vector U and V  

In the same way as in the case of the coordinate system related to the receiving slit, the equation of the conic in the sample plane in implicit form can be obtained  

This equation is important for the study of the effect of absorption because it can be used for estimations of the length of the scattered X-rays in the sample from the diffraction cone vertex to the sample surface. 

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