Crysol can not find Experimental Rg value from the data file

Calculation of SAXS and SANS profiles (CRYSOL, CRYSON), superposition of models (SUPCOMB, DAMAVER, DAMCLUST), database DARA
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Sakura
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Crysol can not find Experimental Rg value from the data file

#1 Post by Sakura » 2015.07.21 17:54

Hi,
I'm new to SAXS. I have this problem all the time when I tried to calculate the theoretical SAXS curve from X-ray model with Crysol and compare with Experimental data.

Here is the message:
#
-------- Radii of gyration [angstroms] ----------

It was not possible to evaluate Rg from the experimental curve

#

The data was processed by Foxtrot. There was reasonable Rg values given by this software. But Crysol cannot calculate the Rg.

Does anyone know the reason for this? Does it have something to do with data format complicity or rather the Data itself ?

Thanks very much!

SaxsMax
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Re: Crysol can not find Experimental Rg value from the data

#2 Post by SaxsMax » 2015.07.21 18:55

Did you cut the bad data points at the beginning that do not behave according to the Guinier law?

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AL
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AUTORG

#3 Post by AL » 2015.07.22 09:37

It might be more convenient to use AUTORG to find the Guinier Rg from experimental data automatically or PRIMUS QT (SAS Data Analysis > Radius of Gyration) to do it interactively.

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