Regarding Instrument parameters

[Ekta Kushwaha]

Dear all,

I just started working in this field. I am learning all the process of using PDFGUI software by book name "Atomic PAIR DISTRIBUTION FUNCTION ANALYSIS"  In this book in every chapter Qdamp and Qbroad is mentioned and I am able to analysis all the data mentioned in this book. Now I had started analysing my sample. The data is from Oak Ridge National Lab PG3  Instrument. Someone please help me analyse this data. I don't have  Qdamp and Qbroad values. How I get this value?? I am also showing my refinement someone please help me how I do this better.

--

Ekta Kushwaha

Ph.D. Scholar(Physics)

Department of Sciences & Humanities

RGIPT, Jais, Amethi, U.P.

[Tomasz Stawski]

Hi Ekta,

To get qdamp and qbroad, you need to refine a standard, such as the one which was used to find the q range of your experiment. That would typically be Si, LaB6 etc. Or anything with a known structure.

Regards,

Tomasz

--
You received this message because you are subscribed to the Google Groups "diffpy-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to diffpy-users...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/diffpy-users/CAHKb-GMVvXGNE8%2Bi_gwZCjbbydKjH%3DWsAX7XrvmyGRhxKSn54g%40mail.gmail.com.

[Simon Billinge]

Dear Ekta,

Tomasz is correct.  

I would also add, that if you are not trying to refine accurate nanoparticle diameters or something like that, you can simply allow Qdamp and Qbroad to refine independently.(assign those parameters to variables, like @50 and @51 or something), in the refinement.  This should result in a greatly improved fit for your data.

S

To view this discussion visit https://groups.google.com/d/msgid/diffpy-users/CABuBjTgqeYEMEAOs6Ho99xFk9uAfvKn_8knjvqvR9%2Bm2ihcE8Q%40mail.gmail.com.

--

Simon Billinge

Professor, 

Department of Applied Physics and Applied Mathematics

Columbia University