Actions required by the user

For each series of diffraction patterns from a time-resolved experiment, some mapping parameters must once be determined interactively. Our procedure, wf premap, assumes that the studied material exhibits a sharp reflection that is located neither on the equator nor on the meridian. In the example, we investigate polypropylene and select the (131) reflection of the crystallographic a2 niodification as the internal standard. With the crystallographic c-aixis parallel to the meridian, the reflection is characterized by the parameters [15] 

Here Sr = l/ i3i is the radius of the Polanyi sphere of the reference (131)-reflection. Finally, the save-set ss is filled with several data the tUt angle d the true radius of the reference-reflection circle on the detector the crystallographic data of the reference reflection the wavelength A and the geometrical data of the 4 clips. This information is sufficient for an automatic processing of the complete series of diffraction patterns recorded in a time-resolved X-ray diffraction experiment of materials with liber symmetry. 

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Detail of the procedure—The level of detail of the procedure relates to the degree to which each step within the procedure specifies the exact actions required by the user. 

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