Differences

This shows you the differences between two versions of the page.

--- fileformat:prm [2019/11/28 14:39] – created smerkel
+++ fileformat:prm [2019/11/28 16:38] (current) – smerkel
@@ Line 1: / Line 1: @@
 ====== Input file for ImageD11 (prm) ======
-An ''.prm'' file is an ASCII file which serves as an input file for the [[software:imaged11|ImageD11]] . The code below shows an example of how a basic ''.prm'' file looks like.
+An ''.prm'' file is an ASCII file which serves as an input file for the [[software:imaged11|ImageD11]]. The code below shows an example of how a basic ''.prm'' file looks like. Explanations are below.
 <code>
@@ Line 35: / Line 35: @@
 cell_sg 62
 </code>
+Information in the ''prm'' file are
+  * **Cell parameters**: cell_a, cell_b, cell_c in Angstrom; cell_alpha, cell_beta, cell_gamma in degrees (typically taken from [[software:maud|Maud]] refinement and can be [[processing:compute_gvectors|refined using ImageD11]])
+  * **Lattice type**: P = primitive, F = face-centered, A = A-centered, ...
+  * **Distance** = sample-detector distance in µm (typically taken from [[software:maud|Maud]] refinement and can be [[processing:compute_gvectors|refined using ImageD11]])
+  * **O-matrix** (check the [[dac_experiments:geometry|concept of the O-matrix]] if you are not sure)
+  * **Omegasign** = rotation direction (1 = clockwise, -1 = counterclockwise)
+  * **Tilt**: Be careful with this one: Tilt in ImageD11 is sometimes not the same as tilt in other software! (usually keep 0 and [[processing:compute_gvectors|refined later using ImageD11]])
+  * **Wavelength** in Angstrom
+  * **y_size**, **z_size**: size of one pixel in y direction and z direction in µm
+  * **y_center**, **z_center**: pixel coordinates of the beam center (usually taken from [[software:dioptas|Dioptas calibration]]: ''y_center = Dioptas Center X'' and ''z_center = 2048 - Dioptas Center Y'' and can be [[processing:compute_gvectors|refined using ImageD11]])
+  * Supplementary optional parameter **cell_sg**. You can also provide your material space group. This has to be done manually with a text editor and can not be done using the Graphical User Interface. If the space group is provided, ImageD11 will use xfab for generate unique hkls.