One needs to play and get the right errors handling here. Test data really do not have any background left. Moore’s technique can fit the background. Subtract background – if there is some flat background in the data still left, one can subtract it here.I am not sure if higher numbers are of much use. Too large number slows down calculations. Next one needs to choose number of bins.Note, this fit is not exciting, but the Rg is actually quite good, as you will see later… In this case the code will attempt to fit one-level Unified fit to the data and provide guess for Rg. To help, you can try using the button “Guess maximum”. It is important to guess large enough number, but not too large. For relatively spherical particles it is close to 2*Rg, for less spherical particles can get larger, may be up to 4* Rg. Generally this is maximum distance for p(r) (=PDDF) function. PDDF modeling requires few right choices… Here are some suggestions how to get the right values for analysis… This created the input graph on the right hand side. In this GUI I have already selected the test data and pushed button “Graph”. Fnct.) In the top part are standard data selection tools. Load data in Igor as seen in the above center and the follow next steps.įollowing GUI is available from SAS menu (under Pair Distance dist. These can be used to compare the results. These data contain Q/Int/error and included is also GNOM generated PDDF in the similarly named file (see center). The zip file and should be in your Igor Pro folder/User procedures/Irena Test data for this tool are included in the Irena folder distributed in You can change font sizes and used font for legend, text boxes and tags in “SAS” - “Other tools”-“Concenter common items”. My observations are noted in text further below.Ĭomment on graph formatting… This tool uses same default font and font size setting as other tools. NOTE: I have observed significant changes on the calculated PDDF with changes with maximum dimension assumed and with errors scaling. I am not sure what else to do with this, so if you want to get more functionality, let me know.
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