[Ifeffit] S02 and k_min

Anatoly I Frenkel afrenke2 at yu.edu
Sun Dec 2 12:13:14 CST 2012


If you use the same  kmin for the standard and the unknown you will minimize the ambiguity.


----- Reply message -----
From: "Michael Morrill" <mike.morrill at gatech.edu>
To: "ifeffit at millenia.cars.aps.anl.gov" <ifeffit at millenia.cars.aps.anl.gov>
Subject: [Ifeffit] S02 and k_min
Date: Sun, Dec 2, 2012 1:02 PM

Hello everyone,

I am currently performing a simple curve fit on bulk MoS2 using an atoms file for crystalline MoS2. I've found that increasing k_min on my fit (e.g. from 2 to 4) improves the quality of the fit (R-factor from 0.028 to 0.009), but also increases S02. If I use a large enough k_min (but not so large I run out of data), S02 gets as high as 1.2 +/- 0.05. This trend is observable for single and multiple k-weight fittings.

While I understand that S02>1.0 does not necessarily invalidate the fit, I am not sure how to justify which parameter values are the best seeing that "0.8<S02<1.0" is often one of the justifications that everything "is reasonable." Ultimately, I want to assume the S02 is chemically transferrable and use it for curve fits on metal oxide supported MoS2.

Any direction on the mater would be greatly appreciated.

Thank you,
Mike Morrill
Ifeffit mailing list
Ifeffit at millenia.cars.aps.anl.gov

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